I posted about this before, but have recently revisted my online winamp control project.
I found a plugin for winamp called
Snowcrash, written by Victor Pavlov. It's an HTTP server plugin allowing remote control of winamp. I altered a few of the files, and wrote up some PHP, and AJAX to display the current song title and elapsed time updated every second. Then threw together a quick little control bar to play/pause/skip songs from my website. I've got a shoutcast server running from my machine as well, so you can listen to the station. Feel free to poke around:
http://www.avclan.net/wip