you can use one of those remotes to control your pc! i have very little electronics know how and i manged to make a working ir reciever using some basic instructions and googling for help. this site is a good start. it was really really easy, cost me £3, all the parts came from maplin and a soldering iron from the market! used cat5 ethernet cable to lengthen it to the fron t of my case and a serial port to plug it into.
http://www.cesko.host.sk/girderplugin.htm this is a good basic diagram
software wise i use uICE which has a nice OSD but girder is also good, however it is far more complex
have a go, it is REALLY easy and works well too, and its less than a fiver!