IE 7 ?
Well, not really, but I thought this might interest some. Note that I have not personally tried this, but might be worth having a look.
”Dean Edwards has taken it upon himself to make Internet Explorer W3C compliant. How? Well, it isn't by patching the application, as you might suspect. He's created a stylesheet dubbed 'IE7' that uses DHTML to load and parse style sheets into a form that IE can understand. Just include the style sheet in your HTML pages, and things should render correctly. The complexity of the CSS transformations is really amazing and shows off the power of this stuff."
I'd be interested if anyone has a real play with it.