Courtesy of Charlie Bess, an EDS Fellow and another of my Irregular colleagues, I stumbled across this awesome demonstration of using Wiimotes and light pens as an alternative to the $10,000 Surface device.
There is none of the hoop-la that accompanies Surface demonstrations but a simple, matter of fact show and tell. Even better, Johnny Chung includes the software source code link to make the rig run. It wouldn't take much to run applications of the kind that Surface uses and compete directly but at a fraction of the cost.
Which reminds me and it's worth mentioning again, The Colgate Twins did a fantastic demonstration of using Wiimotes to control SAP applications in front of 4,000 developers at TechEd 2006. (Disclosure: They're Irregulars too and mighty proud we are to have such innovative folks alongside curmudgeons like me.)
I'd like to see more innovative use of devices like Wiimotes so if readers have use cases then I'd be more than happy to look at them.