Well, whenever QuickTime 6 is good to go. I think Jaguar (OS X 10.2) will come with iTunes 4. Yes, iTunes does use QuickTime. Trivia: 18,000+ applications use QuickTime.<br><br>MP3 leaves out certain frequencies and detail, which gives it its small size. I am yet to see detailed analysis comparing MP3 with AAC, but the industry knows AAC is much superior; it retains or reduces the MP3 file sizes.<br><br>The best thing would be to encode MPEG-4/AAC from your original source.<br><br>--<br>I am Dyslexic of Borg. Fusistance is retile. Your a$$ will be laminated.