There's a capital H in GitHub.

assets/scripts/app/templates/layouts/sidebar.hbs

@@ -9,7 +9,7 @@
 <div id="about" class="box">
   <h4>{{t layouts.about.join}}</h4>
   <ul>
-    <li>{{t layouts.about.repository}}: <a href="http://github.com/travis-ci">Github</a></li>
+    <li>{{t layouts.about.repository}}: <a href="http://github.com/travis-ci">GitHub</a></li>
     <li>{{t layouts.about.twitter}}: <a href="http://twitter.com/travisci">@travisci</a></li>
     <li>{{t layouts.about.mailing_list}}: <a href="http://groups.google.com/group/travis-ci">travis-ci</a></li>
     <li><a href="irc://irc.freenode.net#travis">irc.freenode.net#travis</a></li>

locales/en.yml

@@ -68,7 +68,7 @@ en:
       repository: Repository
       twitter: Twitter
     application:
-      fork_me: Fork me on Github
+      fork_me: Fork me on GitHub
       my_repositories: My Repositories
       recent: Recent
       search: Search
@@ -91,7 +91,7 @@ en:
       admin: Admin
       blog: Blog
       docs: Docs
-      github_login: Sign in with Github
+      github_login: Sign in with GitHub
       home: Home
       profile: Profile
       sign_out: Sign Out
@@ -114,7 +114,7 @@ en:
   profiles:
     show:
       email: Email
-      github: Github
+      github: GitHub
       locale: locale
       message:
         config: how to configure custom build options