Moin Moin,
yeah I know there are a lot of ressources concerning git. Actually I think I found the one I like most.
You can find several documentation types there. Most interesting for starters will be http://book.git-scm.com/1_welcome_to_git.html. This is a nice introduction to git looking at all aspects needed for the daily work with git. Nice is the fact, that you can read it step by step with an increasing level.
Actually I am really thinking of changing from svn to git for eUNIQUE. git is really cool and the functionality is more advanced than in svn.
Cheers
Andy
[Edit:] Please check also this: http://progit.org