átmenetilegesen...

fetchak.com/ie-css3/

Update: Namost a fenti cucc egy csöppet bugos, cserébe itt a PIE:

css3pie.com/ Jeee! :)

Note:

You would expect URLs in behavior: url(...) to be relative to the current directory as they are in a background-image: url(...) style for example, but instead Microsoft decided to ignore standards here and make them relative to the docroot instead.

(forrás)