I've written a little utility for id3 tagging, which allows you you set all the properties of a group of files at once, including extracting the track name, artist and even track number from the filename.. (Or if you work the other way round, rename the track from the tag...)
I've not put it anywhere yet, cause I need to write some instructions, but if anyone is interested, I can bung them a copy.. (windows only for now)
(Not too useful if the Mp3's are on a cd already, but you could copy them to HD before uploading to the empeg, and you'd still save time on updating the properties.. =)

Jazz
(List 112, S/N 00030, 4 gig blue)