Hey, not sure if many people on here have iPhones / iPod touches, but I picked this game up yesterday:
They have a trailer too: http://www.youtube.com/watch?v=ZqNSSEbJ1j
It seems pretty good. The gameplay seems rather simple, but I still had a lot of fun playing it. There are high scores and stuff but I can't get anywhere near what they guys at the top are getting!
I have tried a couple of the other Snowboarding Apps on iPhone and this one is probably my favorite so far. The graphics are definitely the best I've seen by far.
Anyway, if you have an iPhone you might want to check it out. It's only a couple of bucks.