Already, in it's brief time out on the street, a Super Mario Galaxy 2 glitch has been noticed by one of the game's fans. The bug could be useful to players looking to explore the worlds in SMG 2 in unforeseen ways!

Super Mario Galaxy 2 - Yoshi Infinite Flutter Glitch

I know when I get to it, I'll be flutter-jumping just about everywhere imaginable with Yoshi. If I find anything fun, maybe I'll update this post with a screen-shot.