I applied months ago to the Yahoo! Publisher Network, which is still in beta, hoping to be able to compare it to Google Adsense. I had essentially given up on ever being accepted, but just yesterday, I got the coveted acceptance email. For now I am trying it out on a very limited basis (one ad on one page on one site). There's really not enough data in yet to be able to make any comparisons, but so far I'm not disappointed. It's always nice to know there are alternatives, "just in case". You never know when one program will go bust, or cancel your account, or whatever. Glad to know I now have a choice in baskets in which to place my eggs. I'll keep you up to date on anything I find of interest with the program.