Well Sendori.com has a model that is relatively new in the PPC industry, they match domain names to existing brands or websites not a parked page.
http://investor.news.com/cnet?GUID=7758427&Page=MediaViewer&Ticker=%24CNET
In the latest news, they have been acquired by IAC or parent company of Ask. They do have interesting concept, have to check it out and see how it works.
