Extreme Snowboarding
Stoked Rider is a snowboarding game with realistic physics (using Ageia's PhysX engine)--including fluid simulation and avalanches. You roam over a huge space--64 square kilometers of procedurally-created Alaskan moutains. No ski slopes, in other words--just you and the mountain.
Mouse motions are used to steer, with the WASD keys to lean, providing excellent control of your board. (Controls can be mapped to keys if you prefer, and game controllers are supported.)
Sports games from the big publishers are getting better and better at providing what amounts to a TV-quality view of the sports field that gives you a real sense of being, say, a baseball player on the field. And that's a nice fantasy. But... what if you prefer to fantasize about owning or managing your own baseball team?
In that case, what you want is Baseball Mogul. It's a game of franchise management, not on-field management. No, you won't get a high-end 3D experience here, but what you will get is the kind of game that makes you think like, and face the kinds of decisions faced by, the owner of a big league team.