They solicit national advertisers. Penny Web Based primarily on click throughs. Also offers impressive real-time stats. Based on click-through or commission UK based ad Broker. You can also choose your sponsors.
All sites qualify for their service.
Your site needs more than 1,000 visitors per month to qualify for this service. DoubleClick Varies Display paying advertiser's banners on your site. Many options available. You place a small animated 120x60 or 125x125 pixels - button on your site.