The SomethingAwful thread has been hyping it up a ton. If I had a PS3, I'd probably play it, but alas, I do not. I freaking loved SSX as a kid and this would be a giant nostalgia bomb.
Edit: Wait, it's for the 360 too? Guess I'm gonna pick it up soon if I can muster the willpower not to spend 60 bucks on ponies instead.