rspec-rails-uncommitted - Selectively run specs based on git status

Marshall Yount has released a project to make it easier to run Rspec specs in Rails based on git status:

rake rspec:uncommitted    
rake rspec:unpushed
rake rspec:unmerged

It looks like a nice way to filter specs for those using a git-based workflow. Source on GitHub.

UPDATE: As Alex Soulim points out, it works with SVN, too.