Visiting a maliciously crafted web page may allow access to JavaScript objects or the execution of arbitrary JavaScript in the context of another web page.

ENGADGET: Apple releases Windows Safari 3.0.1, squishes security bugs

The search engine's Web-crawling spider now keeps an eye out for viruses and malware as it combs the Web, and shows users a warning page before allowing them to access malicious sites.

FORBES: Made For Hacking

The company also said it would do a better job of restricting copyright violators on the Web from participating in Google's advertising network, and that it would take steps to make it easier for users to find and access previews of copyrighted material, such as songs or videos, on the first Web-search results page, rather than having to click on links to other websites.

WSJ: Google to Penalize Websites Flagged by Copyright Holders