David Pogue's Missing Manual entry for Apple's GarageBand doesn't quite live up to his efforts for the iPhone and for Mac OS X Leopard. It's a good overview of the application, but it doesn't have the same degree of nonobvious helpfulness as the others, and I don't think it's because GarageBand is easier to use than an iPhone.

Still, having read this, I'm looking forward to making some music with GarageBand.