Did the whole world get hacked overnight?

I did a Google search for Windows 7 this morning and every link on the result page says "This site may harm your computer".  If you click a link that says that, you get an interstitial page that says the site could harm your computer but precious little else.

A few minutes later, another Google search for something else said the same thing.  And getting past the error if you want to get to the site is really a pain.

Even scarier to me, a search for "Pittsburgh Post Gazette" says the same thing about our site here, but there's nothing out of kilter with our site that I can find.

This is the danger in a web search monopoly.  Google's obviously got a problem this morning, but the end result is that people's perceptions about those sites could be tarnished.  And for no good reason.

UPDATE: Google has apparently found the problem and fixed it.  Whether they'll own up to it or not is a different story.  We'll wait and see what happens.