I rip a lot of CD tracks into the AIFF format and do not wish them to be part of my iTunes library. I discovered that if I leave iTunes running in the background, I can insert a CD and the CD will be mounted on the Desktop with the album and tracks named from whatever online database iTunes uses. I can then copy the tracks or the entire album using plain old drag-and-drop in the Finder.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20031231183515215