I've a lot of repositories and would be great if there was some way to organize them. Something like folders or labels.
2015-09-06 Dan Bennett: Added link to an issue requesting support for labels (issue #11800). We will finish "projects" under this issue but labels and projects are not mutually exclusive therefore labels should continue to be tracked.
Update 2015-12-17: This feature is currently available as an opt-in beta. Go to your account settings and you should see a new "Manage features" option. Enabling Projects on your account will allow you to create and manage projects on any team for which you are an admin, and see projects on other teams as well. If you'd like collaborators to see your projects as well ask them to turn on the feature on their own account.