Many of the extensions are still in development, so you won’t get 100% of CSS3 yet, but the goal is to get it all in there and even Microsoft has expressed interest in what we’re doing with the library, so there’s hope they might be able to help us get the patching done.

As for the relation to Dean’s work (and that of others), eCSStender is a bit different in that it facilitates doing what Dean did, but for all browsers, not just IE6. It’s a library for working with CSS: enabling both patching of bad browser implementations and allowing for experimentation with new properties and concepts in CSS.

When you get around to implementing it, I’d love to hear your thoughts.