I am running a banner exchange network. It's small but is going really well. I have created several categories and continue to add more as per requirements. Currently there are quite a few Banners in various categories that still run default ads. I am looking for site owners who want to try the banner exchange network. There is a slight difference on how this works other than standard banner exchange. We use CPC i.e. only clicks count as traffic not impressions. This is because most sites simply place banners out of sight to earn impressions. This way is better since only clicks are counted. Also there is no way to create fraud clicks. All ads and categorization is manually checked. All sites are checked against the blacklist. There are only a few supported banner ad formats but new ones can be enabled (please request). I am also looking into HTML banners like those used by zemanta and mgid (image + text) if there are enough sites on the network. This is the site http://bingesite.com/exchange/ If you need help or have questions please feel free to ask.