Last week Google published a study called The Ghost in the Browser: Analysis of Web-based Malware (PDF link) to warn users of the increasing threat posed by malicious software that can be downloaded on to their computers while they surf the web.
The search giant conducted in-depth research on 4.5 million Web sites and found that about 1 in 10 Web pages could successfully "drive-by download" a Trojan horse virus onto a visitor's computer. Such malicious software potentially enables hackers to access sensitive data stored on the computer or its network, or to install rogue applications.
In other news, Google is releasing a horror movie this summer with the same title as this report. Look for "The Ghost in the Browser" in a theater near you by August. ;)