what are the best ppc advertising programs???(like google adsense)?

I use Adsense, YPN, Adbrite and Fastclick, primarily. Adsense works great for some topics, YPN for others. We use Fastclick where we use YPN. What I like about Adsense is, we get direct deposit of our earnings, EFT, and that makes it easy to get paid. You have to test each program, and see what will pay best for your particular keyword topic. Be sure to compare apples to apples. You can not compare a Saturday to a Monday, or the first week of a month to the last week of a month.