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koan - 3:05 am on Aug 14, 2009 (gmt 0)
It doesn't have to be a blockade. It can be a slightly irritating notification at the top of your pages to remind IE 6 users that they do not have access to the full experience and they may encounter bugs.
The websites who choose to ignore IE6 will lose some visitors. Not a ton, but some. A blockade won't end IE6.