git
Learning About git
Free Online Pro Git book
Git User Manual
Git Reference
Install Git
Git Goodies
GitX git GUI
GitX is an awesome FREE history viewer made for OS X. It is a better way to visualize your branch and commit history of your git repository. However, power users (aka "cool kids") will probably only use it for history viewing while they continue to use the terminal command line for checkouts, branching, staging, rebasing and committing.
GitX Home Page
Open in GitX
Git Tower
For those of you who just get panic attacks at the thought of using the Terminal, there is a commercial app for that:
Git Tower
Using git locally on a Subversion Working Copy
OK, so you are addicted to git, and now you have to work on a team project that is hosted in a remote subversion repository ... and it is making you depressed :-(. Well, you can use manage your local svn working copy using git and be happy again!
Don't use the git-svn tool, just use the git+svn protocol instead