I've had Win 7 running for a while now (since the first public leaks). Being biased (I'll be working on the Windows team next summer as an intern at Microsoft) I think its a vast improvement over Vista. In short... Windows 7 is what Windows Vista should have been. I consider it an "evolutionary" release versus a "revolutionary" release.
Though I will say the task bar in Windows 7 is a superior task bar to what Apple offers in Mac OS X. It would be the primary feature I might consider revolutionary. All in all, its a good stable beta, have been running it full time for the last couple months, no problems.
-Z
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