I thought for sure Mad Catz would be the first, but it seem Razor will be the premiere motion control distributor for the PC. The implementation will not be design specific, which is to say it does not require the developer to integrate support into the game. The control will support macros that can be used in any mouse and keyboard game available. Also of note is the fact that you will not have to point at the screen, ala Wii, in order to register your movements so armchair flailing is a go.
A video of Left 4 Dead 2 being played with a prototype is on Kotaku for your viewing pleasure.