I just came across the following nice set of articles on ad networks:

http://www.adnetworkx.org/fundamentals-ad-networks-part-1-4.html

http://www.adnetworkx.org/fundamentals-ad-networks-part-2-4.html

http://www.adnetworkx.org/fundamentals-ad-networks-part-3-4.html

http://www.adnetworkx.org/fundamentals-ad-networks-part-4-4.html

 

Cheers,

Hanu