Personally, I've begun to leave IE behind in my website designs. I give a basic compatibility by making sure IE doesn't misuse my advanced features to horrible result but I don't hold back from creating more advanced inerfaces for browsers that can support them or try to compensate by making an 'as advanced as IE can handle' version of the interface. IE gets pretty much the same thing Lynx does.
Also I've begun advertising this fact on my websites with a "see what you're missing!" page that offers screenshots of the advanced interfaces and a link to download Firefox. People are lazy but if you make them know what they're missing then you can get most of them to switch. (Especially since the alternative is free and easy to install.)
No longer am I going to put up with ignoring the possibilities just because they don't work in IE.
