Microsoft has just released a preview release of IE 9; it is all for public to download and take a test run. It’s a preview release in a “truest” sense because the preview version has lots of limitations: no toolbar, no address bar, no navigate back/forward options, no printing capabilities, etc. etc. However you can press Ctrl+L to navigate to new URLs but cannot go back or forward in the browser history (even the keyboard shortcuts don’t work). It is intended to show the capabilities of the new browser engine in terms of HTML 5 support, CSS3, ACID 3 browser test, and few other standards.
I browsed few of my most-frequently-visited pages and found no hick ups. Looked at the IE9 demos as well and found some of them to be not working.
Get it from http://ie.microsoft.com/testdrive/