The version tool Git has had quite a bit of attention recently. I don't know why this is, it's been around for ages. Zeitgeist perhaps?
Either way, here's some of the better articles and resources I've found over the past few weeks.
Why You Should Switch from Subversion to Git
Introductory Guide to Git Version Control System
Intro to Git for Web Designers
Starting with Git: Cheat Sheet
Git Reference: How to think like Git
A Successful Git Branching Model
How to set up your own private Git server on Linux