Thanks to a heads up from a commenter, after a three month hiatus in the Bahamas, the Microsoft Touch Mouse Sensor SDK has once again resurfaced on the Microsoft Research download site in both 32-bit and 64-bit flavors. Better grab it before it makes another run for it.
If any developers come up with cool uses for the Touch Mouse, leave a comment for others to check it out. Personally I want to see pinch-to-zoom support in Photoshop. Any takers?