Code School - Try Git is an interactive git tutorial.
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Pro Requires less than 30 minutes to teach git basics
The course will teach you all you need to know for getting started with git in a very short period of time.
Pro No setup required
Interactive tutorial that runs in the browser without needing git installed.
Pro It's free
Pro Doesn't assume knowledge of other revision control tools
It's really well designed and is suitable for people not coming from a SVN or mercurial background.
Pro GitHub account creation is part of the tutorial
The course will take you through setting up an account on Github.
Pro Social network integration
You can share your progress in the course through social media (facebook or twitter).
Con Presents a complex subject as simple; creates confusion
Glossing over some of the reasoning for actions may confuse those that want to understand how and why things work the way they do.
Con Barely teaches anything
You cannot learn how to use git from this. You will quickly run into trouble and have no idea how to fix it. Try Git is a mere introduction to advertise Code School's Git Real course.