Adsense all the way . Then comes YPN but its not available worldwide . Then comes the alternatives to the adsense : http://www.johnchow.com/index.php/other-advertising-networks-besides-google-adsense/
There are lots of PPCs (about ten of them are in my mind at the moment) and deciding which one to use depends on your traffic. Keep a sharp eye on bids for your keyword in several PPCs and choose which traffic to send to any particular PPC from your list. For instance I have good experience exposing AdSense ads on mainstream sites, but 3fn Marketing is much better for gambling and pharmacy traffic.
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