And now the one you've all been waiting for. Lets all have a good laugh! Well not quite, because unlike some other contenders, Internet Explorer does actually support @font-face (all be it only in .eot format). In fact it's supported it for a while, with even IE6 providing complete support!
Nonetheless, with the exception of font-face, Internet Explorer does display a marked lack of support for almost every kind of advanced/progressive feature. Hopefully the IE team will be able to look at this in a future release, but I'm not holding out any hope.