diff --git a/Makefile b/Makefile
index 65e9f64..fe7ff3b 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ main.js: main.bundle.js
 	$(Q)npx babel --minified main.bundle.js -o main.js
 
 
-main.bundle.js: client/index.ls client/authws.ls client/bulma.ls client/card.ls client/column-edit-modal.ls client/font-awesome.ls client/modal.ls client/navbar.ls client/project-creation-modal.ls client/project.ls client/task-creation-modal.ls client/task.ls client/task-removal-modal.ls client/todowebsocket.ls client/validation-modal.ls  
+main.bundle.js: client/index.ls client/authws.ls client/bulma.ls client/card.ls client/column-edit-modal.ls client/font-awesome.ls client/modal.ls client/navbar.ls client/project-creation-modal.ls client/project.ls client/task-creation-modal.ls client/task.ls client/task-removal-modal.ls client/todowebsocket.ls client/users-cache.ls client/validation-modal.ls  
 	@echo '  BUN >   main.bundle.js'
 	$(Q)npx browserify -t browserify-livescript client/index.ls -o main.bundle.js
 
@@ -109,6 +109,7 @@ $(PACKAGE)-$(VERSION).tar.gz: distdir
 		$(PACKAGE)-$(VERSION)/client/task.ls \
 		$(PACKAGE)-$(VERSION)/client/task-removal-modal.ls \
 		$(PACKAGE)-$(VERSION)/client/todowebsocket.ls \
+		$(PACKAGE)-$(VERSION)/client/users-cache.ls \
 		$(PACKAGE)-$(VERSION)/client/validation-modal.ls
 
 dist-xz: $(PACKAGE)-$(VERSION).tar.xz
@@ -130,6 +131,7 @@ $(PACKAGE)-$(VERSION).tar.xz: distdir
 		$(PACKAGE)-$(VERSION)/client/task.ls \
 		$(PACKAGE)-$(VERSION)/client/task-removal-modal.ls \
 		$(PACKAGE)-$(VERSION)/client/todowebsocket.ls \
+		$(PACKAGE)-$(VERSION)/client/users-cache.ls \
 		$(PACKAGE)-$(VERSION)/client/validation-modal.ls
 
 dist-bz2: $(PACKAGE)-$(VERSION).tar.bz2
@@ -151,6 +153,7 @@ $(PACKAGE)-$(VERSION).tar.bz2: distdir
 		$(PACKAGE)-$(VERSION)/client/task.ls \
 		$(PACKAGE)-$(VERSION)/client/task-removal-modal.ls \
 		$(PACKAGE)-$(VERSION)/client/todowebsocket.ls \
+		$(PACKAGE)-$(VERSION)/client/users-cache.ls \
 		$(PACKAGE)-$(VERSION)/client/validation-modal.ls
 
 help:
diff --git a/client/authws.ls b/client/authws.ls
index 21beb3b..970e4ef 100644
--- a/client/authws.ls
+++ b/client/authws.ls
@@ -86,9 +86,9 @@ AuthWS = (socket-url) ->
 		self.get-user-by-credentials login, password
 
 
-	self.get-user = (uid) ->
+	self.get-user = (login_or_uid) ->
 		self.send request-types[\get-user], JSON.stringify {
-			uid: uid
+			user: login_or_uid
 		}
 
 	self.register = (login, password) ->
diff --git a/client/index.ls b/client/index.ls
index a6375d4..fefb6e8 100644
--- a/client/index.ls
+++ b/client/index.ls
@@ -9,13 +9,15 @@ Task            = require "./task.ls"
 Project         = require "./project.ls"
 Modal           = require "./modal.ls"
 Navbar          = require "./navbar.ls"
-# ValidationModal = require "./validation-modal.ls"
+UsersCache      = require "./users-cache.ls"
 
 {create-projector, h} = maquette
 projector = create-projector!
 
 model = {
 	# view: login, project-list, project, network-error (TODO: other views, such as rights)
+	# FIXME: Replace model.current-view by an object that has a .render
+	#        method.
 	current-view: "login"
 
 	viewed-project: void
@@ -35,6 +37,9 @@ model = {
 
 	# { uid => user data }
 	users: {}
+
+	# uninitialized UserCache
+	users-cache: void
 }
 
 model.authd-url =
@@ -52,7 +57,6 @@ model.todod-url =
 console.log "authd url: " + model.authd-url
 console.log "todod url: " + model.todod-url
 
-
 #
 # network configuration
 #
@@ -61,6 +65,9 @@ model.authd-ws = AuthWS model.authd-url
 model.todod-ws = todows.create-socket model.todod-url
 
 
+model.users-cache = UsersCache model.authd-ws, ->
+	projector.schedule-render!
+
 #
 # authd messages management
 #
@@ -147,7 +154,7 @@ model.todod-ws.add-event-listener \lists-list, (message) ->
 
 	model.project-list := message.lists.map (x) ->
 		old-project = model.project-list.find((.id == x.id))
-		new-project = Project x, model.todod-ws, model.users
+		new-project = Project x, model.todod-ws, model.users-cache
 
 		if old-project && new-project.id == old-project.id
 			new-project.tasks = old-project.tasks
@@ -159,13 +166,13 @@ model.todod-ws.add-event-listener \lists-list, (message) ->
 model.todod-ws.add-event-listener \new-list, (message) ->
 	console.log "New project", message
 
-	model.project-list := model.project-list ++ [ (Project message.list, model.todod-ws, model.users) ]
+	model.project-list := model.project-list ++ [ (Project message.list, model.todod-ws, model.users-cache) ]
 	projector.schedule-render!
 
 model.todod-ws.add-event-listener \list-updated, (message) ->
 	console.log "Project updated", message
 
-	new-project = Project message.list, model.todod-ws, model.users
+	new-project = Project message.list, model.todod-ws, model.users-cache
 
 	model.project-list := model.project-list.map (project) ->
 		if project.id == message.list.id
@@ -175,7 +182,7 @@ model.todod-ws.add-event-listener \list-updated, (message) ->
 
 	if model.viewed-project && model.viewed-project.id == message.list.id
 		# create tasks in order to have the updated project properties
-		new-project.tasks = model.viewed-project.tasks.map (task) -> Task task, new-project, model.todod-ws
+		new-project.tasks = model.viewed-project.tasks.map (task) -> Task task, new-project, model.todod-ws, model.users-cache
 		model.viewed-project = new-project
 
 	projector.schedule-render!
@@ -197,7 +204,7 @@ model.todod-ws.add-event-listener \tasks, (message) ->
 	console.log "Tasks received", message
 
 	project = model.project-list.find((.id == message.list))
-	project.tasks := message.tasks.map (e) -> Task e, project, model.todod-ws
+	project.tasks := message.tasks.map (e) -> Task e, project, model.todod-ws, model.users-cache
 
 	if model.viewed-project && model.viewed-project.id == project.id
 		model.viewed-project := project
@@ -213,7 +220,7 @@ model.todod-ws.add-event-listener \task-created, (message) ->
 		model.viewed-project := list
 
 	if list
-		list.tasks ++= [ Task task, list, model.todod-ws ]
+		list.tasks ++= [ Task task, list, model.todod-ws, model.users-cache ]
 		projector.schedule-render!
 
 
@@ -226,7 +233,7 @@ model.todod-ws.add-event-listener \task-updated, (message) ->
 	if list
 		list.tasks = list.tasks.map (e) ->
 			if e.id == task.id
-				Task task, list, model.todod-ws
+				Task task, list, model.todod-ws, model.users-cache
 			else
 				e
 		projector.schedule-render!
diff --git a/client/project.ls b/client/project.ls
index 3182b59..ae06b19 100644
--- a/client/project.ls
+++ b/client/project.ls
@@ -26,10 +26,11 @@ orphan-tasks = (tasks, columns) ->
 	tasks.filter (task) -> (! has-column) || inexistant-column task, columns
 
 
-Project = (self, todod-ws, users) ->
+Project = (self, todod-ws, users-cache) ->
+	console.log "CREATING PROJECT", users-cache
+
 	self.todod-ws = todod-ws
 	self.tasks = []
-	self.users = users || []
 
 	self.selected-task-id = void
 
@@ -94,7 +95,7 @@ Project = (self, todod-ws, users) ->
 			h \a.navbar-item.has-text-success {
 				key: "navbar-new-task"
 				onclick: ->
-					modal := TaskCreationModal self, self.todod-ws, void, self.users
+					modal := TaskCreationModal self, self.todod-ws, users-cache
 			} [
 				h \span [ "New task" ]
 
diff --git a/client/task-creation-modal.ls b/client/task-creation-modal.ls
index ed26e48..039004b 100644
--- a/client/task-creation-modal.ls
+++ b/client/task-creation-modal.ls
@@ -43,13 +43,18 @@ color-to-form-selection = (self, color, current-color) ->
 		selected: current-color && current-color == color
 	} [ color ]
 
-user-form-selection = (self, uid, is-selected) ->
+user-form-selection = (users-cache, uid, is-selected) ->
 	h \option {
 		selected: is-selected
 		value: uid.to-string!
-	} [ uid.to-string! ]
+	} [
+		if user = users-cache.get-user uid
+			(user.profile?.full_name) || user.login
+		else
+			uid.to-string!
+	]
 
-TaskCreationModal = (project, todod-ws, task, users) ->
+TaskCreationModal = (project, todod-ws, task, users-cache) ->
 	task ||= {}
 
 	# copy not to override anything on cancel
@@ -141,7 +146,7 @@ TaskCreationModal = (project, todod-ws, task, users) ->
 							for permission in PERMISSION_LEVELS
 								[
 									for uid in project.permissions[permission]
-										user-form-selection self, uid,
+										user-form-selection users-cache, uid,
 											(self.assigned_to == uid)
 								]
 						]
diff --git a/client/task.ls b/client/task.ls
index 406b90f..ba40c29 100644
--- a/client/task.ls
+++ b/client/task.ls
@@ -6,11 +6,16 @@ TaskRemovalModal = require './task-removal-modal.ls'
 
 {icon} = require "./font-awesome.ls"
 
-Task = (self, project, todod-ws) ->
+Task = (self, project, todod-ws, users-cache) ->
 	modal = void
 
 	self.render-login = (uid) ->
-		h \p [ '@' + uid.to-string! ]
+		h \p [
+			if user = users-cache.get-user uid
+				'@' + user.login
+			else
+				'@' + uid.to-string!
+		]
 
 	self.render = (args) ->
 		args or= {}
@@ -32,7 +37,7 @@ Task = (self, project, todod-ws) ->
 				h \div.title.is-5 [
 					h \a.has-text-grey.is-pulled-right {
 						onclick: ->
-							modal := TaskCreationModal project, todod-ws, self, project.users
+							modal := TaskCreationModal project, todod-ws, self, users-cache
 					} [
 						icon \cog
 					]
diff --git a/client/users-cache.ls b/client/users-cache.ls
new file mode 100644
index 0000000..107555c
--- /dev/null
+++ b/client/users-cache.ls
@@ -0,0 +1,27 @@
+
+UsersCache = (authd-ws, on-user) ->
+	self = {}
+
+	on-user ||= (user) ->
+
+	# uid => user
+	self.users = {}
+
+	authd-ws.add-event-listener \user, (message) ->
+		user = message.user
+
+		self.users[user.uid] := user
+
+		on-user user
+
+	self.get-user = (uid) ->
+		if user = self.users[uid]
+			user
+		else
+			console.log "Sending request for #{uid}"
+			authd-ws.get-user uid
+
+	self
+
+module.exports = UsersCache
+