Some of my most have audio application that are free:
Audiograbber 1.83 at
http://www.audiograbber.com-us.net/ It's thural yet easy to use, and as oddly as it sounds drop the Lame mp3 encoder into the program file for the best internal mp3 encoder.There are to many cool features to list here.Goto
http://www.audiograbber.com-us.net/MP3Gain from the guys at Sourceforge
http://mp3gain.sourceforge.net/ analyzes and adjusts mp3 files so that they have the same volume.The changes MP3Gain makes are completely lossless.I'd suggest backing up your files first when you use this in case something goes horribly wrong.They are trying something new since i obtained it.
Then there is Mediajoin.The name says it all.This is one of my favorites.
http://www.audiovideosoft.com/ (on the lefthand side of the page)
I hope these come in handy for you.
Rodney