try using SortableMixin, but it's buggy

assets/javascripts/app/controllers.coffee

@@ -2,10 +2,12 @@ require 'helpers'
 require 'travis/ticker'
 
 Travis.Controllers = Em.Namespace.create
-  RepositoriesController: Em.ArrayController.extend
+  RepositoriesController: Ember.ArrayController.extend
     contentBinding: 'layout.repositories'
+    # sortProperties: ['sortOrder']
+    # sortAscending: false
 
-  RepositoryController: Em.Controller.extend # Travis.Urls.Repository,
+  RepositoryController: Em.Controller.extend
     repositoryBinding: 'layout.repository'
 
   TabsController: Em.Controller.extend
@@ -18,11 +20,11 @@ Travis.Controllers = Em.Namespace.create
     repositoryBinding: 'layout.repository'
     contentBinding: 'layout.builds'
 
-  BuildController: Em.Controller.extend # Travis.Urls.Commit,
+  BuildController: Em.Controller.extend
     repositoryBinding: 'layout.repository'
     buildBinding: 'layout.build'
 
-  JobController: Em.Controller.extend # Travis.Urls.Commit,
+  JobController: Em.Controller.extend
     repositoryBinding: 'layout.repository'
     jobBinding: 'layout.job'
 

assets/javascripts/app/models/repository.coffee

@@ -1,15 +1,15 @@
 require 'travis/model'
 
 @Travis.Repository = Travis.Model.extend
-  slug:                 DS.attr('string')
-  owner:                DS.attr('string')
-  name:                 DS.attr('string')
-  description:          DS.attr('string')
-  lastBuildId:          DS.attr('number')
-  lastBuildNumber:      DS.attr('string')
-  lastBuildResult:      DS.attr('number')
-  lastBuildStarted_at:  DS.attr('string')
-  lastBuildFinished_at: DS.attr('string')
+  slug:                DS.attr('string')
+  owner:               DS.attr('string')
+  name:                DS.attr('string')
+  description:         DS.attr('string')
+  lastBuildId:         DS.attr('number')
+  lastBuildNumber:     DS.attr('string')
+  lastBuildResult:     DS.attr('number')
+  lastBuildStartedAt:  DS.attr('string')
+  lastBuildFinishedAt: DS.attr('string')
 
   lastBuild: DS.belongsTo('Travis.Build')
 
@@ -27,6 +27,10 @@ require 'travis/model'
     duration
   ).property('data.lastBuildDuration', 'lastBuildStartedAt', 'lastBuildFinishedAt')
 
+  sortOrder: (->
+    @get('lastBuildFinishedAt') || '9999'
+  ).property('lastBuildFinishedAt')
+
   stats: (->
     # @get('_stats') || $.get("https://api.github.com/repos/#{@get('slug')}", (data) =>
     #   @set('_stats', data)

assets/javascripts/app/templates/repositories/list.hbs

@@ -1,5 +1,5 @@
 <ul id="repositories">
-  {{#each repository in controller.content}}
+  {{#each repository in controller}}
     {{#view Travis.Views.RepositoriesItemView contextBinding="repository"}}
       <li {{bindAttr class="view.classes"}}>
         <a {{bindAttr href="view.urlRepository"}} class="current">{{slug}}</a>
@@ -9,7 +9,7 @@
           <span class="duration_label">{{t repositories.duration}}:</span>
           <abbr class="duration" {{bindAttr title="lastBuildStartedAt"}}>{{formatDuration lastBuildDuration}}</abbr>,
           <span class="finished_at_label">{{t repositories.finished_at}}:</span>
-          <abbr class="finished_at timeago" {{bindAttr title="lastBuildFinishedAt"}}>{{formatTime lastBuildFinished_at}}</abbr>
+          <abbr class="finished_at timeago" {{bindAttr title="lastBuildFinishedAt"}}>{{formatTime lastBuildFinishedAt}}</abbr>
         </p>
         {{#if description}}
           <p class="description">{{description}}</p>

assets/javascripts/lib/mocks.coffee

@@ -3,15 +3,15 @@ require 'ext/jquery'
 responseTime = 0
 
 repositories = [
-  { id: 1, owner: 'travis-ci', name: 'travis-core',   slug: 'travis-ci/travis-core',   build_ids: [1, 2], last_build_id: 1, last_build_number: 1, last_build_result: 0, description: 'Description of travis-core' },
-  { id: 2, owner: 'travis-ci', name: 'travis-assets', slug: 'travis-ci/travis-assets', build_ids: [3],    last_build_id: 3, last_build_number: 3, last_build_result: 1, description: 'Description of travis-assets'},
-  { id: 3, owner: 'travis-ci', name: 'travis-hub',    slug: 'travis-ci/travis-hub',    build_ids: [4],    last_build_id: 4, last_build_number: 4, description: 'Description of travis-hub'},
+  { id: 1, owner: 'travis-ci', name: 'travis-core',   slug: 'travis-ci/travis-core',   build_ids: [1, 2], last_build_id: 1, last_build_number: 1, last_build_result: 0, last_build_finished_at: '2012-07-02T00:00:00Z', description: 'Description of travis-core' },
+  { id: 2, owner: 'travis-ci', name: 'travis-assets', slug: 'travis-ci/travis-assets', build_ids: [3],    last_build_id: 3, last_build_number: 3, last_build_result: 1, last_build_finished_at: '2012-07-01T00:01:00Z', description: 'Description of travis-assets'},
+  { id: 3, owner: 'travis-ci', name: 'travis-hub',    slug: 'travis-ci/travis-hub',    build_ids: [4],    last_build_id: 4, last_build_number: 4, last_build_result: undefined, last_build_finished_at: undefined, description: 'Description of travis-hub'},
 ]
 
 builds = [
-  { id: 1, repository_id: '1', commit_id: 1, job_ids: [1, 2], number: 1, event_type: 'push', config: { rvm: ['rbx', '1.9.3'] }, finished_at: '2012-06-20T00:21:20Z', duration: 35, result: 0 },
+  { id: 1, repository_id: '1', commit_id: 1, job_ids: [1, 2], number: 1, event_type: 'push', config: { rvm: ['rbx', '1.9.3'] }, finished_at: '2012-07-02T00:00:00Z', duration: 35, result: 0 },
   { id: 2, repository_id: '1', commit_id: 2, job_ids: [3],    number: 2, event_type: 'push', config: { rvm: ['rbx'] } },
-  { id: 3, repository_id: '2', commit_id: 3, job_ids: [4],    number: 3, event_type: 'push', config: { rvm: ['rbx'] }, finished_at: '2012-06-20T00:21:20Z', duration: 35, result: 1 },
+  { id: 3, repository_id: '2', commit_id: 3, job_ids: [4],    number: 3, event_type: 'push', config: { rvm: ['rbx'] }, finished_at: '2012-07-01T00:01:00Z', duration: 35, result: 1 },
   { id: 4, repository_id: '3', commit_id: 4, job_ids: [5],    number: 4, event_type: 'push', config: { rvm: ['rbx'] } },
 ]
 
@@ -23,10 +23,10 @@ commits = [
 ]
 
 jobs = [
-  { id: 1, repository_id: 1, build_id: 1, commit_id: 1, log_id: 1, number: '1.1', config: { rvm: 'rbx' }, finished_at: '2012-06-20T00:21:20Z', duration: 35, result: 0 }
+  { id: 1, repository_id: 1, build_id: 1, commit_id: 1, log_id: 1, number: '1.1', config: { rvm: 'rbx' }, finished_at: '2012-07-02T00:00:00Z', duration: 35, result: 0 }
   { id: 2, repository_id: 1, build_id: 1, commit_id: 1, log_id: 2, number: '1.2', config: { rvm: '1.9.3' }, allow_failure: true }
   { id: 3, repository_id: 1, build_id: 2, commit_id: 2, log_id: 3, number: '2.1', config: { rvm: 'rbx' } }
-  { id: 4, repository_id: 2, build_id: 3, commit_id: 3, log_id: 4, number: '3.1', config: { rvm: 'rbx' }, finished_at: '2012-06-20T00:21:20Z', duration: 35, result: 1 }
+  { id: 4, repository_id: 2, build_id: 3, commit_id: 3, log_id: 4, number: '3.1', config: { rvm: 'rbx' }, finished_at: '2012-07-01T00:01:00Z', duration: 35, result: 1 }
   { id: 5, repository_id: 3, build_id: 4, commit_id: 4, log_id: 5, number: '4.1', config: { rvm: 'rbx' } }
   { id: 6, repository_id: 1, build_id: 5, commit_id: 5, log_id: 5, number: '5.1', config: { rvm: 'rbx' }, state: 'created', queue: 'builds.common' }
   { id: 7, repository_id: 1, build_id: 5, commit_id: 5, log_id: 5, number: '5.2', config: { rvm: 'rbx' }, state: 'created', queue: 'builds.common' }