There are many pay per click networks, but the leaders are Google Adsense, followed by Yahoo! Publisher network (still in beta since around 2 yrs!)

Some of the 2nd tier networks are exoclick, clicksor, bidvertiser, adbrite, etc. These pay real bad when compared with Adsense or YPN. You are very lucky of you get 2 cents per click. These should be considered only if no other choice is available.

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