Convert flac to mp3 using ffmpeg, retain ID3 tags
Finally found the info I needed in the ffmpeg docs to keep the ID3 tags when converting from flac to mp3:
for FILE in *.flac; do ffmpeg -i "$FILE" -ab 320k -map_metadata 0 "${FILE%.*}.mp3"; done
ETA 8/27/2012: updated "-map_meta_data 0:0" command to "-map_metadata 0" for the new version of ffmpeg.