Aligning Audio Levels for Bulk CD-to-MP3 Conversion?

cmaxx asks: "Has anyone got a tool or method for aligning the recording (playback) levels of their CD's when converting to mp3? It's winding me up that some CD's were recorded quietly (for dynamic range reasons perhaps) while other were recorded normally or loudly, or with too little bass/top-end/whatever. It means that playing my mp3 collection randomly means I'm forever having to change the volume or equaliser settings to get the most out of the music. I know it's not a straightforward problem, but I'm curious to know, in this age of napster, if someone's cracked it - and if I can too." Interesting thought. At the very least some form of database is necessary to store the audio levels for each song.