GitX is a git GUI specifically for Mac OS X. It currently features a history viewer much like gitk and a commit GUI like git gui. But then in silky smooth OS X style!
MARK EVERITT This makes day to day use of git extremely pleasant. On the back of this I recommend git as my VCS of choice simply because it -just works-. (Version 0.6.3)
BROZ This is a nice tool, but there's a bug in this and the previous version that keep me from upgrading.
The "Commit" button (looks like an arrow pointing to the right with a bar in front) that appears in the window header is always disabled. Since it's pretty important to be able to do the the things that button enables, this bug is a deal killer.
Once again, I'll revert back to 0.6.1 and do my work. (Version 0.6.3)