EDIT: Ugh, replied to a 2 year old post. Sorry.

I don't know if mp3tofid v4 is "officially" released, but Pim has had it available on his website for quite some time:

http://www.macroscoop.nl/~pim/empeg/mp3tofid/

I have been using it for several months, and it works wonderfully. I have it running as a cron job every few hours, and I have my empeg setup in my car to rsync via a wireless bridge in the trunk. So, any CDs I rip or podcasts I download are synced to my empeg automatically. Can't beat that.