This plugin has been in development for almost a year, and was just recently ported to Sublime Text 3. It features an alternative take on integrating git into Sublime Text, inspired by great projects such as fugitive (for vim) and magit (for emacs). It works on Windows, Mac OS X and Linux.
There are screenshots, documentation and installation instructions on https://sublimegit.net
It's a commercial plugin, which has allowed me to spend a lot of time refining it based on early user feedback, as well as provide great support. I'm charging 10 € for a personal license which is good for both Sublime Text 2 and 3, on all the platforms. There's also a free and unlimited trial, which doesn't require a license.
Not seeing your favourite feature? Get in touch on twitter (@SublimeGit) or mail (support at sublimegit.net) and let me know. Feedback is very welcome!