I did a lunchtime session on some Git basics last week. It is clearly a different mindset which takes a bit of time to adapt to. But it's worth the effort, the popularity of Github, now sitting at over a million users should be a good indication that there's a few treasures awaiting.
Here are a couple of books which will hopefully be useful to grow your git knowledge.
Pro Git Book
The Pro Git book can be read online or downloaded for free on various eReader formats. You can also get the paper copy from Amazon.
The Git Community Book
The community book is another downloadable book maintained on github.