I was thinking about Adsense, Adbrite, Clicksor,...
I know most people prefer Adsense (highest bids) but if I ask you to think about such system from Publisher's and Advertiser's side, let's help me to create a simple service. What would you put into it to get simple and easy-to-use thing that would still attract Publishers and Advertisers? Forget high bids because we can't compete with Google here. Anything else than that goes below:
(Thanks)