I'm actually not very troubled by the prospect of breaking encryption on audiobook files that I've paid for, but I have yet to find an audiobook player as good as the one that Audible provides. I'd use it to play all my podfic, too, if I could. Playing long audiobooks as MP3s is really unsatisfactory because you can't set bookmarks.

Thanks for the links--the second one doesn't seem to be valid, but I drilled through and found some good stuff. Looks like I might be able rig up something.