Once again the team at Opera have outdone themselves.
Opera is now the browser that has by far the best standards support (the previous Opera had pretty much excellent standard support too, the best imo) and it also passes the Acid 2 test.
Not only that, but it seems faster, has support for widgets (sort of like extensions at Firefox, only they can’t mess up your browser, hehe), bit torrent and a slew of features and improvements.
I suggest you try it out for yourself http://www.opera.com