Update: This problem seems to be fixed now.
Something’s up with Google. Right now every Google search result contains “This site may harm your computer” malware warning beneath it. See screenshot below:
The above screenshot displays search results for keyword ‘Google’. As you can see each and every result is labeled as “This site may harm your computer’. When you click on a search result to visit the page, a detailed warning message appears. Must be a glitch on big G’s end. By the way FireFox 3 Safe Browsing which obtains attack site data from the same service as Google (stopbadware.org) does not display warnings for any of the legitimate sites.