This browser is not ready to be released. There is a serious bug that has been reported dozens of times during both the beta and the RC, and that is that IE9 does not render pictures with any reliability. I am tired of loading a page, only to see the pictures not show up, and be force to do "Duplicate Tab" over and over until I finally produce a tab that will actually render the pictures that the web page contains.
I and others have reported this MANY times at connect.microsoft.com. There's also a neowin thread on the problem. http://www.neowin.net/forum/topic/958964-images-break-in-internet-explorer-beta-9080276000/
The problem goes unsolved, and seemingly dismissed and uninvestigated. I've seen some of bugs at Connect dismissed as "Not Repro", others closed as "Fixed in the RC" (which is false), and others remain open but with no sense of urgency.
I really don't understand the problem here, as to why the IE team seems not to care about simple, basic, and essential functionality.