Bill Sawyer, that is a good idea for a poll. Even though this site's log files already give those answers to the admins, I'd be interested in knowing. I'm not sure if I'd include SkinBrowser as an option though, since it uses IE for several parts, and a lot of people probably switch between it and thier regular browser.
As for the W3C compliance thing, yeah yeah, I know.

IE is famous for not exaclty complying, but it is mostly because MS tends to introduce new features that the W3C has not yet adopted (IE supported hover effects for text long before anyone else). I also agree that it can be a little too forgiving. I have designed many a site that looked great in IE, only to find out it was broken in every other browser.
My rule of thumb these days is to design for Netscape Navigator 4.7. If it works in that browser, it will work in just about every modern browser on any platform.