@Daniel - On the nature of the Acid tests
Unfortunately, Acid3 has become the 'processor MHz' of the browser wars; while it is a very well thought out and useful test of esoteric functions, it does not really tell one much about how a browser works in the real world.
What most commenters don't realise (or just conveniently forget) is that many of the Acid3 tests are checking for compliance with *draft* specifications (CSS3, HTML5, etc) which will not be published 'standards' for a considerable time.
It should be noted that NO browser, including FF Chrome or Safari, is even 100% compliant with CSS 2.1 yet :(