Tips and tricks for making a better Boutique 808 in Garageband. (These tips are directed more so for the beginner).
A list of some of the best tips for mixing in Garageband.
Here's a comprehensive, step-by-step explanation of 15 different editing tips in Garageband (they're actually useful).
An article on the legality of using Apple Loops, as well as a short discussion on copyright strikes on YouTube.