Getting the Git version control system running on your Mac is easy and fast.
Perform one of the following:
OSX Installer
You can download an installer package for Mac from here: http://code.google.com/p/git-osx-installer
MacPorts
With MacPorts installed, you can run this in your command line:
$ sudo port install git-core +svn +doc +bash_completion +gitweb
If you don't have MacPorts installed, yet, download and install it from here: http://www.macports.org.