I briefly mentioned coverdisks with Fiath a while back, and will be dumping mine once I've finished dumping "proper" games (Amiga & Atari ST). From what I remember the requirement/preference (whichever it was) was that the disk should have at least 1 game on it, which may rule out some stuff - hopefully Fiath/IFW will clarify that one.
On the coverdisks line it would be helpful (at least to me) to draw up a list of what's verified ok as we go along as I have about 1000 coverdisks with as many as 5 or 6 copies of a single disk (some sealed etc), so don't really fancy dumping all 1000
I know we may have to dump them all anyway as the duplication process was probably done on the cheap without verification etc.