Not sure if this is the best section to bring this up, but it's worth a shot.

I've got a PB hooked up to my TV that I use basically as an AppleTV. I've got some emulators that I'd like to use with it as well, but wired controllers just aren't my bag anymore.

Anybody know of a wireless gamepad I could use?

You can use a Xbox360 wireless controller with the $20 usb adapter.
There is a 3rd party driver that I use.
http://tattiebogle.net/index.php/ProjectRoot/Xbox360Controller/OsxDriver