Here are the results:
This is the first time that I've not seen a release of Firefox 3.0 being faster than the previous release - the speed of Firefox 3.0 RC3 is virtually identical to that of Firefox 3.0 RC1 (within the tolerances of the test at any rate). On the other hand, Opera 9.50 final shows dramatic improvement over the betas. However, Opera has a long way to go to catch up with Firefox and Safari.
I also took the opportunity to put each browser up against the ACID 3 CSS compliance test.