Will any one provide me list of PPC Programs?

Hi I am new to Pay Per Click programs, Now I want to know the list of PPC programs. I knew something about Google Adsense, YPN, MSN Adcenter. Will any one give me list of PPC Programs please.. If I was provided by links that gives me the list of PPC and their explanation is also very nice to me to learn the PPC programs. Hi guys I am waiting for your replies..

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