There is a solution to variable bitrate MP3's
http://www.geocities.com/ryebread2112/
A lot of people are using this new utility to add the bitrate right into the MP3 filenames. Search on '44KHz' to see what I mean.
Awesome Song.[160Kb 44KHz 3'35].mp3
It handles VBR format perfectly:
Awesome Song.[194Kv 44KHz 4'17].mp3