An initiative by .NET magazine:
The premise is simple: Internet Explorer 6 is antiquated, doesn’t support key web standards, and should be phased out.
While all that is true, corporate networks are the lagging party here, and I don’t see IE8 changing this yet. There’s an entire industry based around supporting IE6 and the intranets that depend on it.
I expect IE7 users to rather quickly move to IE8, but I also expect the IE6 users to be around six months from now in numbers not inconsistent with the current rate of migration.