I'd never this that this day would come, but it actually seems that Google has decided to block all sites in their index. Try searching anything, it will be marked as spam. I see the same results in the swedish and english version, in Firefox and in Internet Explorer. "This site may harm your computer", clicking that link does not seem to be possible, and I'm guessing it's because it gets millions of hits right now.
Gmail is also marking emails as spam, they are probably using the same system as Google search. The warning message is: This message may not be from whom it claims to be.
- Techcrunch found out just a couple of minutes after this post.
- Twitter is buzzing with people trying to figure out what's going on.
~40 minutes later: Google is working just fine again, no need for panic. They have even written a blog post on the issue, explaining what happened. Seems the URL "/" was mistakenly added as a "bad URL" in the spam filters. Human error obviously.
Heads will be rolling at the Google HQ (or at least someone just got a new nickname).