Yahoo Publisher Network

Yahoo are currently playing catch up to Google and are trying to release their own context sensitive advertising service. This promises to be an excellent alternative to Google Adsense but in reality is likely to be a simple copy with the same restrictive terms and conditions as Google, including $100 minimums on payouts. The system seems to have been in beta test for several years now, perhaps explaining why Yahoo as a company is suffering. Unfortunately while you can visit their site and sign up to register for an account don't expect to actually hear back from them. They are either extremely selective or are simply not accepting new publishers and advertisers, either way they won't even bother to get back to you to let you know this and most applicants won't even receive a reply saying their application has been rejected. Thus until it goes live and it becomes clear what type of website owners Yahoo will be targeting I cannot place it any higher in this list.
Advert wise Yahoo Publisher Network will feature:
• Display ads related to the content on your site. You'll earn revenue from qualified clicks.
• Integrate other Yahoo! services into your web site, including Add to My Yahoo! (RSS), Y!Q and much more to come...
• This beta program is just the beginning. Our mission is to deliver products and services based on the needs of the publishing community.