I forgot to add that I'm 5'2" and ride a 49 cm (XS) frame.

Byke: I found the crack in my frame before I ever rode the bike, so it was definitely still under warranty. That said, the guys at the LBS obviously missed it while they were assembling the bike. My LBS is awesome - great customer service and great mechanics. The crack just wasn't that noticeable. I would see what Scott says first, but I would definitely push them for a new frame if they try to tell you no luck because your warranty expired (especially if the crack is characteristic of the head tube defects they've had problems with in the past).