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I agree with you, worker -- here's a place where MS can do the world a major favor by leveraging their hefty market share. They can make a high-functioning blocker program that people can trust and that integrates into IE. MS will get a boost in good-will, and the advertising world will need to adopt to less intrusive, more permission based approaches to the web.
In fact, MS may be the only entity who can do something definitive about Gator/Claria et. al. And of course it is also in their financial interest -- I understand that currently Search Scout takes traffic from major search engines, including MSN.
Shadows Papa
I don't see any adverts very often either for that matter - the adblocking CSS from the Firebird tips page takes care of most of them.