@Charles: Why is there no way to customize the chrome? Suppose I want to drag the favorites icon to the left and have tabs on a different row than the address bar. I can't do that now. Why not?

Writing addons for IE is notoriously complicated. Has anything been done about that with IE9? If not, why not?

What if the HTML5 standard changes/is finalized within IE9's lifetime and before IE10 is out. What's going to happen? A patch?