For people who want to convert their purchased m4p files to mp3: iTunes tries pretty hard to prevent this, because it figures you will do something illegal. I simply wanted to play the music I purchased with a different mp3 player. My thought, at first, was to burn the m4p files to an audio CD and then rip them to mp3 (yes, I know there is some slight quality loss). Anyway, iTunes doesn't recognize my burner, so I figured I would try Toast. Since I have Quicktime 6.2 installed, Toast automatically converted my m4p's to aif's when I added them to the audio CD I was creating. After that, I could simply rescue them from Toast's cache, but it was actually easier to select "Save as Disc Image" under Toast's "file" menu. After that, you're free to encode using whatever program you want from the aif's on the disc image. If someone can figure out a solution that doesn't require commercial software, let me know.