ExtremeTech has a browser roundup, they tested Firefox 3.04, IE7, Google Chrome, Opera and Safari to find out which browser is the fastest and most compatible. You can check it out over here. Overall Google Chrome came out as the winner:
Google uses its own knowledge of search and browsing habits to optimize Chrome, but Chrome is still in early development. It's also clear from our testing that Microsoft really needs to get IE8 out the door—IE7 not only has compatibility issues, but is substantially slower in many ways. Firefox 3.1 should also improve Firefox's scores.