I loaded the site in FF4b8, and was wondering why the demo was so unimpressive, and then decided to try it in Safari, where I saw how it was supposed to work. Seems nice and easy to implement, but unless it can work on other browsers without having me do two completely different implementations, I doubt I'd use this instead of drawing my own overlays and positioning my modal windows the old-fashioned way.

Edit - I guess the '-webkit' tags everywhere should have clued me in... They mention that it should work for Firefox, but I'm not feeling like putting in the work to see if that's true. It would be nice if FF support could be added to the demo code.

The animated version is pretty sweet, but again, I'm not sure how FF does with those CSS transitions and transforms. I've been using jquery animations which seem to have a fairly wide browser support, though they rely on javascript rather than these slick CSS implementations. It's just not clear how much I'd be shooting myself in the foot with regards to browser compatibility trying to go this route instead of tried-and-true javascript.

Firefox fixes were merged in the repo, never really had the time to update the Demo.

Very clean implementation. Any recommendations on the best implementation for modal form windows at the current time (until we CSS3 is better supported)?

If you're using jQuery then, http://jqueryui.com/demos/dialog/

FF3.6 here... not centered, won't close. Cool in Safari as mentioned but far too exclusive to consider using anytime soon. Things we get to look forward to though.

Very nice, would like to see a decent reference source for transformations.