I have a lot of bandwidth setting around and I am considering setting up a banner exchange for free, for now. I am considering setting up three categories. One for normal, one for children, and one for adult. I need to know about how many banners and what time length each should show? So if you would be interested, P/M me, so I can contact you when it is up and running. Anyone that can offer other suggestions please feel free to post or p/m me also.
I think normal will because it pertains to a majority of the sites. Although I am sure adult will be up there as well. Good luck with your banner exchange network!