I've struggled with helping others learn git as well; you can see some of my thinking at (http://think-like-a-git.heroku.com/#1) and (http://confreaks.net/videos/612-cascadiaruby2011-think-like-...). Currently working on a longish standalone website for those who (like me) can't stand to slow down enough to sit through an entire 20-minute video. ;>