How to convert a library of DRM'd iTunes AAC songs to unprotected mp3s for free?

"I don't know of any program that does this (I don't buy iTunes tracks). But here's the basic steps, and the absolute-last-resort method to accomplish what you want to do.

Generic method:

Crack the encryption.
Decode the AAC data to PCM/WAV.
Encode the PCM/WAV data to MP3.

Absolute worst-case I'm-not-kidding-find-another-way method:

Burn the tracks to CDR using iTunes (you may want to use a CDRW, especially if you have a lot of tracks).
Rip the tracks from the burned disc to MP3, using whatever ripping software you prefer. If you use iTunes for the ripping, set the encoding options to MP3.
(optional) wipe the CDRW disc and burn the next batch of tracks.

(Note this probably won't work if you can't play the AAC tracks in your iTunes.)"

I'm trying http://www.tuneclone.com - it fools iTunes into thinking that you're burning to a CD when actually you're ripping an MP3 copy. It means that you're not hacking the DRM (which would be piracy) but making a copy to play on any device that you own, which is your right.