About
AudioSurfBoard is where gamers can upload and share videos of themselves playing AudioSurf.
Wikipedia on Audiosurf: Audiosurf is an IGF award-nominated puzzle - rhythm hybrid game created by Invisible Handlebar. Its track-like stages visually mimic the music the player chooses, while the player races across several lanes collecting colored blocks that appear in sync with the music. Currently, the full version is only available for purchase through Steam and includes the entire Orange Box soundtrack embedded in the game to play. Audiosurf is the first game to use Valve’s Steamworks technology. The game was released on February 15, 2008 over Steam.

The official forums can be found here.
An interview with the developer of Audiosurf at the Game Developers Conference 2008: