X10 devices are wireless home automation devices. Specifically, I have created a Squeak-based driver for the X10 MP3 Remote. Right now it controls XMMS under Linux, and shouldn't have any problems controlling WinAmp with the right FFI calls.
I haven't released this yet as I've got a few rough edges to work out; however if you want it, just email me and I'll send it along..it works quite well for my purposes.