Just go here and check the speed of the
JS engines yourself:
http://wd-testnet.world-direct.at/mo...jsTimeTest.htm
Tests by different magazines suck anyways.
Opera 10 is the fastest in HTML/CSS rendering from what I've felt. Though
JS engine is still slow. Firefox 3.5 has a blazing fast
JS engine but it's still not as fast as Google Chrome's. Both use the Tracemonkey
JS engine though.
But what else does Google Chrome has apart from it's blazing fast
JS engine?

Just an overhyped browser IMO.
Opera = all in one package. No need of extensions. Whereas, the extensions of Firefox make it unbeatable.
Opera user over here.
IE8 being faster is a joke:

See the screenshot.