Oh my, yes. The Firefox team has an experimental specification for making use of the advanced features of OpenType and AAT, possibly through the CSS @font-variant property. This could get hairy rather quickly and I have to imagine it’d be tricky to write out the full description by hand, but the typographical goodness would be hard to pass up. Be sure to check out the hack.mozilla.org page about this to see some nice preview images.
Notes about webdesign
Steam is gathering behind the open font / redistributable typeface movement, which will hopefully usher in some better typography options on the web. Arguments abound as to whether letting designers use whatever font they want on the web is a good thing, and the situation’s been moving at a snails pace for years due to the reluctance of both the font foundries and the browser makers, so it’s good to see actual, workable options on the horizon. Here are a handful of recent projects, all of which seek to ameliorate the licensing issues inherent in the use of embedded fonts: