Just thought someone else might want to use it.
http://mp3gain.sourceforge.net/ (http://mp3gain.sourceforge.net/)
I have been using this for about a year, and it works great. What it does is make all your mp3s the same volume.
MP3Gain does not just do peak normalization, as many normalizers do. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear.
Also, the changes MP3Gain makes are completely lossless. There is no quality lost in the change because the program adjusts the mp3 file directly, without decoding and re-encoding.
Agreed, I've also been using this for ages... maybe 2 years.. good program.