ValueClick Media is the resulting network of the acquisition of Fastclick by Valueclick in late 2005. This new combined network combines the best part of Fastclick, namely their impressive publisher interface and statistics, and Valueclick, which was their large international media selling team.
Google is the leader in search technology on the internet, and their AdSense Network offers accurately targeted text adverts targeted to the actual content of each page, therefore being able to offer high eCPMs.
RealTechNetwork is a relatively new advertising network, but is establishing a reputation as reliable and providing decent rates, especially from US/Canada/UK.
BannerConnect are a well established Netherlands-based ad network that offer good fill rates across all countries
