For a start, it means adding ID3 write support to emplode.

You promissed that already!

Hm, some rippers put checksum in the comment field. Could emplode do similar (i.e. is calculating CRC, MD5 or something like that on a tune file too processor-intesive to be routinely done)? This way we could massage ID3s to our liking, or even repeat (perfect) rip, and duplicates would still be recognised.