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jomaxx - 5:59 pm on Feb 3, 2006 (gmt 0)
Heck, there might even be simple "run-of-network" campaigns, which are the antithesis of what AdSense was originally conceived as.
Hard to predict; some sites already do much better than this with a regular AdSense block. But given that the ads will be far less targeted than a standard text ad, I tend to agree with the lower estimates.