With a little help of google, here is some useful data if your looking for new traffic sources.
Based on a list of over 600 trackers/adservers, here are the top ones based on Google Ad Planner data (Page Views Per Month)

Not all of these are ad networks, but some probably warrant further investigation.
Oh and here is another useful list:
http://purplebox.ghostery.com/?p=1016021825
100 most popular tracking elements. Here is the top 10:
1. Google Analytics
2. Google Adsense
3. Facebook Social Plugins
4. Quantcast
5. DoubleClick
6. Facebook Connect
7. Comscore Beacon
8. Omniture
9. AddThis
10. OpenX
Bold ones are adservers/networks.
Theres a browser plugin that will show you when you browse whats tracking you:
http://purplebox.ghostery.com/
Useful when you want to find out who's serving the ads on a particular page.
tjin, I like the way you roll.
very nice work
Google Ad Planner is dumb how it categorizes things. Xtend Media is NOT "South Asian Music" lol
Thanks for the share.
TIJN awesome friggin resource!
let me add this:
TOP WEB PROPERTIES
http://ir.comscore.com/releasedetail...leaseID=579805
TOP MOBILE
http://www.comscore.com/Press_Events...r_Market_Share
TOP SERP
http://www.comscore.com/Press_Events...ngine_Rankings