We'll have an in-depth review soon, but currently this is the snowboarding game for future games in the genre to beat. X2 Snowboarding has great tilt controls, awesome cell shaded graphics, a single player game mode with unlockables, a licensed soundtrack, and even local multiplayer via Bluetooth and WiFi.
I was extremely impressed with the game in our preview, and look forward to it soaking up a good deal of my spare time in the future. In case you missed it the first time around, here is a brief gameplay video again:
App Store Link: X2 Snowboarding, $6.99