On my desk, I just have the Altec computer speakers that came with the package but when I ran my coax, and Cat5e cabling, I included 4 audio/mic cables that I can use for record/playback with the desktop computer. I don't use that for as much as I did before, but if I want to use my laptop to play iTunes, I just plug the 1/8" stereo plug into the keystone insert in the wall plate and switch to the correct input on the amp. That doesn't happen often though, because I have a ReQuest server but it's nice to be able to use it if I sell the server or it goes down for any reason (which it hasn't in the 2 years I have had it). I also have lines from the system to the basement and garage stereos, so I can set the server to Random/Continuous and listen to it anywhere.
It's all a far cry from my first system.