Hey, nice to hear of another MP3Car enthusiast who uses Delphi, woo hoo!
I've used MPEGPlay.pas before too; works like a champ! I ran across some cool mixer components if you're interested; they let you control the entire Windows mixer (not just the volume control) so you can do stuff like fade in/out other audio sources and the like.
Right now I'm working on a relational database-oriented MP3 player for my in-car PC product; it will be awesome when finished...
Delphi is expected to be available for Linux in the near future, too; I can't wait!
Web site: http://www.m2pc.com
Yahoo Pager: m2pc123