Hi,
Would you know how to build/deploy an application so that the voice tag application which ships with Windows Mobile can detect it (I'm guessing it needs to be registered with the OS, but not sure) and execute it? I think this would be the easiest way to launch an app...
The video you linked to was very interesting, but even in 2009 I cannot see any of these techs being easily reachable!
Cheers,
Matt.