I played around a bit with the new CSS 3 functionality as well as the video tag of html 5.
I put together a nice litte demo of what could be possible with a combination of HTML 5, CSS 3 and Extjs. Nothing special, but maybe I'll do another example the next days which will show the webdesktop with such functionality.
(The Video takes a few seconds to load, because my server is not the fastest one..)
Once the video starts, click the buttons at the bottom to see the animations.
Currently, this one does only work in Safari 5...See code comments for help..Have fun!