I bought a 22" widescreen LCD monitor, and it fit juuuust right. I moved the shelves higher to accommodate the extra height, started using the keyboard tray for my actual laptop to give the monitor some extra height. My footstool is still under the desk, this time useful for if I want to stretch out my legs.
I put the CD player/cassette player/radio back into its box. I haven't ever really used it. Need to sell it or whatever.