We were just talking about this in the chatbox.. Thanks for posting on it and +Rep!
It appears it is happening around the globe: http://answers.yahoo.com/question/index?qid=20090131064050AAlghGj
I wonder if Google is just having a massive world-wide server problem, or if they were hacked etc.
Very strange indeed, the first time I have ever seen this happen on such a large scale.
i dont believe for a second that google could have been hacked, it would takes teams of hackers to be able to crack their security, and even if they did manage they would have surely have detected and disconnected before any damage could have been made.
Chances are they are upgrading or performing maintenance to the server/s that contain data relating to harmful websites, and due to that service being unavailable their search servers are marking all sites as harmful to protect their customers during the outage.
Yahoo too it flagged, picture below.
Yeah earlier when I was searching for random things almost every site was black listed, I thought I was going
Seems they attributed it simply to 'human error'

http://news.bbc.co.uk/1/hi/technology/7862840.stm
Quote:
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For a period on Saturday, all search results were flagged as potentially harmful, with users warned that the site "may harm your computer".
Users who clicked on their preferred search result were advised to pick another one.
Google attributed the fault to human error and said most users were affected for about 40 minutes.
"What happened? Very simply, human error," wrote Marissa Mayer, vice president, search products and user experience, on the Official Google Blog.
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