Lots of good choices for banners - not simply the horizontal and a few odd sized banners that
scorescash limits me to per site - and for all of the sites!
Variety in banner sizes is good too, not to mention some verticle banners
(not that you guys haven't done this yet... I just think you need more!) Just look at ARS - they offer TONS of banners in may different shapes and sizes and that's one reason why promoting them is so convenient.