Anyone tried it yet? http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home?os=win7&arch=a&browser=ie
With AdBlock and NoScript you pretty much have the internet on lock-down with Firefox. Dunno why anyone would go with something else.
Out of the three Betas I am testing, IE has the edge for me, which is a very surprising thing for me to say. Firefox 4.0 Beta 6 is also available for download.
I use Firefox on one comp., Chrome on another. IE will never be used by me, ever. No matter how good people say it is.
People claim that Firefox is impenetrable to spyware, but I don't believe it. Explorer puts cookies into known folders where you can watch them. Firefox distributes them into many folders, classified by the site which caused the cookie, so you can't verify that they later delete themselves. You lose control. Anti-spyware programs can't find them in Firefox and they go undetected. So is born the myth that Firefox stops all spyware.