Then rip as mp3s. Then you'll probably have to do a bunch of tag editing to put back in the song titles, album, and artist information. If you do this within iTunes you'll at least retain the song titles. Otherwise you get something like "various artists" and "compilation album." If they are iTunes Plus tracks, then you can convert to mp3 within iTunes. You just need to make sure that your preferences for ripping are mp3. Right click on song(s) and select "convert selection to mp3." It actually creates a duplicate song in mp3 format but it retains song, artist, and album information. Unfortunately, you can't do this with regular iTunes purchased stuff because of DRM, so it's burn and rip for those.
In the future, try to buy your songs DRM-free. Amazon sells mp3 downloads and I just heard that Napster's entire catalog is DRM-free. As you know, mp3 work on practically any player.