Just what it says on the tin!
The batch export feature is probably one of my absolute favorite additions to Cubase in the past few years, it can be an enormous time/nerve saver on certain project types.
The file naming scheme is great, but it should have a counterpart in the ID3 dialog as well when exporting multiple mp3:s.
Edit: And the track numbering as well, option to set to Cycle Locator ID for instance.
IMHO
Alexander