http://hginit.com, a wonderfully written Mercurial-tutorial by Joel Spolsky from Fog Creek Software (Trello). Especially when you come from Subversion like me, Joel made me think several times “Ohhh, yes, you’re right!”:
Subversion always gives you this horrible dilemma. Either the repository is full of bugs because it includes new code that was just written, or new code that was just written is not in the repository.
Go check it out: http://hginit.com