As you may have already heard, Google has released their own browser - Google Chrome. It's a beta at this stage, but what's there now is quite impressive: the main thing that cought my attention is the way they're handing JavaScript. Essentially they are compiling JavaScript into machine code, which yeilds a much faster performace.
Google Chrome and V8
So, i've run some javascript tests and was amaised by the results: Chrome performed about 30 times faster than IE and almost 2 times faster than Firefox 3!
Javascript performance comparison
Browser Time
Chrome
1609.2ms +/- 5.4%
Firefox 3
2910.2ms +/- 1.1%
Firefox 2
16212.2ms +/- 1.4%
IE 7
42156.4ms +/- 6.2%
(This was on a Windows XP on Intel Core 2 Duo 2.33GHz)

I haven't tested other browsers, but it would be interesting to compare the results.

Have a look at the comic Google has created to demonstrate all the cool stuff Chrome has to offer.