Google really play a giant rule on this matter, but if there's a "Biggest advertising network" that will come-up, more people will jump off.
For PPC advertising it google with adwords and adsense, for affiliate marketing I would go with Consumption Junction.
CJ also considered as one of the biggest advertising network, we can't deny that there are still coming... They might out on the way later on.
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aolaybar, I don't know if it's the next biggest, but AdlandPro is the most visited advertising network (along with its' super business community) and one of the most established since I been a member from when they were only an advertising ezine founded in '99 (I believe).
Thanks for the post... newly heard. I'll take a visit on the site. Who knows this is the next biggest advertising network.