I ran across this music format by accident:
Very interesting. It apparantly has optimal quality at only 96 Kb/s (unlike MP3's 320K). I converted a lot of my MP3s to the format, and am quite satisfied with the quality and file size. The only down side I see is that Winamp doesn't support an ID tag on the VQF files. I don't think, that is...
Anyway, just thought I'd share this with you all, so you can cram more songs onto your carputer. Enjoy!