Day Two: No One Even Attempts Hacking Chrome at Pwn2Own Competition - Google Chrome - Lifehacker.
Found this interesting. I didn't make it to CanSecWest this year, but several of my friends did go to this event/competition. While I did see that every other major browser was cracked on day one, (IE8, Firefox, and Safari) Chrome didn't even get tried, apparently.
While Chrome does use the Webkit (safari) engine, Chrome starts each browser tab in a separate process which is in a 'sandbox'.
On the usability side, I've been using Chrome on the Mac since they opened up the dev channel for it, and I really like it.