MaybeMaybe this is a temporary issue. I will check later in the night today and update/close this thread. [2013-02-27] For most of the world, this is a temporary issue. I will check later in the night today should now be resolved and update/close this thread.non-repro, and the general consensus is that it was a Google glitch!
I searched for 'StackOverflow' on Google UK, both via the Omnibar and the Google UK homepage. The resultant URL: www.google.co.uk/#q=stackoverflow&...
Displayed results (larger image):
Actual page on doioig.gov (larger image):
This has no resemblance to the content displayed by Google.
I have tested this using Chrome Incognito without logging into Google so there is no search bubbling and also no plugins on Chrome that are playing these tricks.
I am not tagging this as a bug as it seems unlikely that this is an issue within Stack Exchange control.
Edit 1:
Searching for stackoverflow
on the US or anysome other region specific site, this effect is not observed. But searching explicitly for stackoverflow doioig
brings up a slightly different result: