Git and Git Flow Cheat Sheet - Excellent - check here first
Git Cheatsheet - interactive
Git flow chart to fix problems
Better Git configuration - Scott Nonnenberg - excellent! I especially like the alias glog = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'
Little Things I Like to Do with Git - lots of good information, like how to summarize all of your commits for today
Dangit Git - Git is hard: messing up is easy, and figuring out how to fix your mistakes is impossible. So here are some bad situations I've gotten myself into, and how I eventually got myself out of them in plain english.