I came across a script that will fix a number of HTML and CSS in IE to make the page look more like IE7's rendering (and one for enhancing IE7). I'm surprised it took me so long to come across this, but sounds promising. It does have a drawback of there being an extra file to download and also won't help users with JavaScript disabled, but still a pretty cool thing. I haven't tested this personally, as I have no real need, but figured others might get a kick out of it. Think I'll add it to the sticky as well.
http://code.google.com/p/ie7-js/
Author is Dean Edwards
http://code.google.com/p/ie7-js/
Author is Dean Edwards