Want to get rid of a CD around the house (who uses CDs any more)?  Pop it into your drive, open it with Dolphin, browse to the 'MP3' (or 'Ogg Vorbis') folder and copy the files to your media directory.  The KDE IO system automatically generates (rips) the "files" when the copying process goes to transfer them.

Now we just need the same thing for DVDs and I might be motivated enough to get rid of *all* the disks. (In case you didn't get the reference...)