So... haven't been back here in a while and realized that I kind of left some fans of this game high and dry. o2skiing was a fun project to work on back in 2007, then I just got involved in too many other things and never got back to it. I'm sure everyone has moved on now, but sorry to anyone who was disappointed.
If you're interested in doing anything with it with the game, here is all of the c source code.
https://drive.google.com/file/d/0B-nhVKlXoMdmR3RKb3dMUWtha1E/view?usp=sharing
It's all under MIT license, so do whatever you like with it.
Also might be useful if you can code and are interested in learning basic 3d graphics or how geometry and physics are used in a game.
If you just want to play the game (pretty dated but still fun), the original alpha version is available on some download sites, just google o2skiing game.