Removing DRM from protected AAC is kindof a pain. I had about 300 songs, and Itunes wants 30 cents each, so about $90. I bought a converter noteburner, tuneclone something like that for $30 and converted all mine. worked pretty good.
Just deleted the origionals in itunes and dropped the converted ones back in and everthing is good now. Everytime I buy a new itunes song I just automatically convert it to MP3 in Itunes. They dont charge for new downloads. Just older stuff.