I take my PowerBook with me to work and usually stream my music from the PB to my work comptuer (better speakers). I recently upgraded from a CRT iMac to a 15" LCD iMac and when I went to play one of my iTMS-purchased songs it told me I had already authorized three computers. Now, I was able to go back and de-authorize the old CRT iMac so I could listen to my music. The problem I'm having is that I have NO CLUE what other computer I authorized! I went through all the other Macs here but it wasn't any of them. Am I s.o.l. here? I'm very tempted to just toss them all to my converter app and make them non-DRM'ed mp3s so that I don't have to deal with this mess, but I'd still like to figure out a "normal" way around this, if possible. Thanks.