Has anyone had any experience with any PC remotes that can be used to control functions on an XP system?

I'm looking for something where I can program buttons for chanup/chandown, numbers, mute,  and other shortcuts inside slingplayer.  There are lots of presentation remotes on eBay, but I'm hoping someone might have a recommendation for me so I dont waste money on something that won't work.

I use my SlingBox Classic to watch TV while I'm trying to fall asleep, and it would be really useful to have a remote so I didnt have to get up and do the channel-flipping manually.  Ive thought about a wireless keyboard, but those are a little too large to fit in the headboard.