Now that you've stocked your iPod with dirt-cheap, DRM-free MP3s (see), why not let others enjoy your great taste in music? No, I don't mean file-sharing those MP3s (that's illegal), I mean popping your iPod into a speaker dock and filling the room with your tunes.
Decent docks often run upwards of $100 or more, but Amazon has the SDI OutLoud iH80B iPod speaker dock on sale for $39.99. No rebate, free shipping, new in box--sweet.
The iH80B runs on 8 "C" batteries or AC power; the latter charges your iPod while docked. It includes a remote, three iPod inserts (it's compatible with most models), an AV-out jack for viewing iPod videos on a TV, a line-in jack for connecting other kinds of MP3 players, and even a microphone jack for iPod karaoke. Add an optional second speaker to bring the total output power to 20 watts. (Yeah, the single speaker is a bit weak, but probably fine for smallish rooms.)