Does anyone know of a site that has info on how contextual ads work and their most common implementations? Are there Open Source scripts for this? Thanks in advance
Gene, I'm not sure if this is exactly what you're looking for since it's not open source, but it might provide some insight. http://www.hotscripts.com/Detailed/16303.html
I do NOT recommend w3matter's adrevenue/revsense! There have been complaints from several other users as well.