Hey,
I got so frustrated about the MP3 bitrates that I wrote a program to show this information regardless of which Gnutella client you use. The program adds bitrate to the end of the filenames:
The Blah Song.[128Kb 44KHz 5'10].mp3
If you searching gNet for "Blah", then add the keyword "44KHz" to get the files that have this bitrate information attached. It's starting to catch on, but obviously not everyone is doing this yet.
It's available at:
http://www.zdnet.com/downloads - search for MP3 File Tagger
and
http://www.geocities.com/ryebread2112 - Homepage for it, more information here.
Cheers.