I've seen a request for different ads by guest / member, but what about by membergoup?
e.g.
guests get to see lots of ads,
regular members get to see a different set of ads in different locations,
subscribing members would see a much reduced set of ads,
admins get to see a different set (or none!) in different locations,
i.e. the ads you see depend on which membergroup you are in.
This would be most useful for me, and I'd imagine something that would be highly desirable for a lot of site admins.

John.
P.S. Great work on the ad mod - it's extremely useful and highly used. Kudos to you.