"Internet Explorer, Safari and Firefox. The one major Web browser left standing? Google Chrome"
"That said, I should also note that Pwn2Own didn't offer prizes for anyone beating up on other popular Web browsers such as Opera or the Linux operating system."
However, one should be careful with drawing conclusions about the security of the individual products. Pwn2Own is mainly a hacking extravaganza. Nobody knows who spent how much time on finding security holes and developing the appropriate exploits. Charlie Miller, for instance, told the The H's associates at heise Security that he focused on Safari from the start. He added that it's open to speculation whether it would have taken him the same amount of time to find an exploit in Chrome. In Miller's opinion, Pwn2Own isn't a suitable basis for conclusions about which product is the most secure."
Taken from http://www.h-online.com/security/news/item/Pwn2Own-2010-iPho...
"Pwn2Own didn't offer prizes for anyone beating up on other popular Web browsers such as Opera or [for beating up on] the Linux operating system" is how I parse it.