> It also doesn't solve the issues for most advertisers. I can't imagine that a large e-commerce site would want to make thousands of individual deals with sites that may or may not generate the desired traffic.
Agreed.
Idea: Is it possible to replace ad networks with ad brokers? The broker keeps a ledger of interested parties on both sides. Someone looking to buy ad space specifies relevant market segments (data analysts, single moms, golfers, etc), and the broker connects them to relevant sites.
Metrics could be solved by passing a token when linking back to ad space buyer, or the broker still embedding, but much less intrusively than an ad network, both the blog/site and the ad space buyer tracking independently and reporting back to broker for backwards statistics, etc.
I'm sure there are other issues, but this is just off the top of my head.