This might be something to look into. Its a wireless trackball.
Own one; use it for my HTPC. Recommended.
Apparently you can set it up with a Wiimote if you've got Bluetooth on the thing.
Rather counterintuitively, Wii Remote support is piss-poor under Windows compared to Mac or Linux. In my experience, the Windows 7 Bluetooth stack doesn't recognize the thing half the time, and the most common way of getting it to work if Windows DOES see it is through a
scripting program with
bizarre license terms.
It might actually work in this case with
WiiuseJ since, IIRC, that will let you use the thing as a mouse right out of the box, but you won't be able to do any button reassignment or anything.
(I really want to create a program that maps buttons to keys/mouse clicks using WiiuseJ, with maybe a nice little XML config file structure, but fuck if I've been able to find that kind of time.)
Course, there's also a hardware issue there; you need a "sensor" bar (which is actually just some IR LED's, as most of you probably know) that doesn't require the Wii to be turned on in order to run. Can be done with candles, or you can just rewire the thing to use USB. I bought me a
Sensor Bar HD and am pleased with it; I find it's less jerky than the sensor bar that comes with the Wii. Pity it doesn't have an off switch, but it's not like diodes use a ton of juice or anything.