2) The ability to save the current state of the system so I could go back to it later, or merge it with another run.

• I would like to be able to process the files, clean up the easy ones and save them, then run another batch, and repeat. Then come back and look at the harder ones in one pass, this might also help with identifying content. This would also help in larger databases or longer running processes...

From: http://forums.musicbrainz.org/viewtopic.php?id=5442