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
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