[AJ007]

I don't know who at MS thinks this is a smart idea. If DNT gains widespread use, it will pretty much hand the entire US display ad market over to Google.

In terms of revenue per impression, revenue/behavioral tends to beat out contextual. After contextual you've got site targeting and run of network, in that order. Google is the only one that does a really good job on contextual, that I've seen.

As of last month IE market share is now down to 16.4% (w3schools.) What IE does won't be so important because soon no one will be using it anyways.