http://www.thinkgeek.com/stuff/41/wiihelm.shtml?cpg=50T
I thought this was pretty funny. Don't know about functional, but funny. For $25 though, if I saw it in the store I might get one. I can imagine playing Kororinpa: Marble Mania like this--until I have to start turning boards upside down and stuff.
Can anyone think of any kind of game that would go well with this?
(SPOILER)April Fools. I'm a day late, they still have it on their site.