You may want to do a search on
http://www.google.com or sourceforge.net
I found a file called mp3munched.pl This is a perl script that you copy to the directory where your mp3 files are and then it will convert your mp3s to wav and burn them all in one step. Its a very nice little script. Just make sure you run this as root and edit the script with your burner info.
-Xion