I downloaded the new IE9 Beta on my Windows 7 machine today. I like it. It has tear off tabs, pinning specific sites to the taskbar, is faster, better standards support, and really maximizes the website space and minimizes the amount of space the browser controls take up. I have noticed a few websites that will need tweaking before they are compatible with IE9 in Beta. For example, in WordPress when I am creating this blog post then I can not click to select text or to put the cursor in a certain position within the text. I do not know if it is a browser issue or a WordPress issue. However, these are some of the reasons to avoid installing IE9 for everyday use and to only use it for evaluation purposes for the time being.