For the few of you that actually love rhythm games, such as the likes of DDR and PaRappa the Rapper, I've been playing this great free game called osu! that is essentially Elite Beat Agents on the computer. Lots of songs to download and play, customizable skins, doubles as pseudo-music player, and best of all, it's totally free! Give it a shot, you might like it. If you have any questions about gameplay, installation, or anything else, please PM me. osu! site: http://osu.ppy.sh/
I remember being addicted to osu! awhile back. Only thing I disliked is how long it took to download all the beatmap packs.
Yeah downloading beatmaps can be quite a pain, but I rarely do that. I always DL seperate songs since the beatmap packs usually have a ton of awful songs and around 2 decent ones.