Every search on Google equals This site may harm your computer
I was just trying to find the site url’s for My Toolbox post and everything I searched on was harmful to my computer. Looks like this Google inspired technology has been around for a while according to codinghorror.com
Even links to Google support are harmful (see the second item in the search results image)
The problem finally went away and had me wondering if there was a virus or browser plug-in gone bad. But I found confirmation of the problem here http://www.seorly.com/?p=69
Looks like Google had the problem worldwide.