More and more cool Mozilla Firefox extensions seem to be popping up nowadays. FoxAmp is a Firefox extension that integrates (to an extent) Winamp into the Firefox browser. It adds several buttons into your statusbar, allowing you to play, stop, pause, and change tracks.
There isn't any indication of which track is being played (umm, beyond listening and recognizing it with your sense of hearing, that is), which I got around with the Lounge skin that I'm currently using (it displays a small window for a short while indicating the track name when a new track is played).
Still, a very cool tool added to my list of favorite extensions.