That seems sort of user-hostile, but hey, it's your call. I don't consider even IE 8 to be a burden any more. It doesn't get some CSS effects right, but stuff

That seems sort of user-hostile, but hey, it's your call. I don't consider even IE 8 to be a burden any more. It doesn't get some CSS effects right, but stuff generally renders OK without modification. I can sort of understand blocking IE 8 if you really don't want people to see your site without border-radius or whatever, and if you don't feel like taking the time to patch it up with conditional code, and if all those lost visitors don't matter to you... But so far I've found IE 9 to be spot-on. Are you experiencing a rendering glitch with the latest beta? If not for rendering issues, then what's to be gained by blocking potential visitors or users just because you don't like their choice of software?