Magic M4A to MP3 Converter
Full user review
"Super-easy user interface"
Easily batch converted about 250 songs from .m4a (itunes) to MP3s, so I could play on a non-ipod mp3 player
IT's FREE SO FAR as I can tell
Somewhat lengthy process (which I can understand since I converted so many files at once) but I could not see how far along is was or see an estimate of the time remaining