There are about 500 MP3 audio files that I want to be transcoded into Ogg, but ffmpeg doesn't preserve audio tags. Is there some kind of trick to make ffmpeg preserve the audio tags, another program I should be using, or some command that can be run after the ffmpeg process is complete?

This conversion will be running on 2 CPU cores as a batch job with GNU parallel compiled from the GNU website, on Ubuntu 10.10. Thanks!