Though still in pre-release IETester sounds like a promising application that tests websites in a number of versions of Internet Explorer from IE 5.5 through to beta 1 of IE8.
I’ve been playing around with it, and my god, disassociated looks terrible in IE 5.5 and 6, but I already knew that.
While there’s still work to do this is certainly looking promising. The “holy grail” of website testing per chance?




