Oh, one thing I found out regarding audio CDs, if you have KDE v3.2.3 (doesn't work for KDE v3.2.2):

If you stick an audio CD in, fire up the Konqueror Web browser, and type audiocd:/ in the address bar, it'll show you a list of the tracks on your audio CD! On mine, it also shows a folder called "Ogg Vorbis", and I can drag track(s) out of that folder and Konqueror will convert/save them as Ogg Vorbis files.

Apparently some versions of Konqueror that you can download from KDE also have MP3 conversion support built in.

Other protocols Konqueror supports (such as "fish" for ssh) can be seen by pulling up the KDE Info Center and clicking on Protocols.

Edit: I should say, it works with KDE 3.2.3 on Kanotix BugHunter 7a, but not with KDE 3.2.2 on Knoppix 3.4. Haven't tested it with Knoppix 3.6 yet.