Google Search Mash revealed

Well, turns out I wasn't crazy.

Google have a new, but unbranded, site at www.searchmash.com where they can "test user interface ideas without Google's brand skewing the tests".

More likely it's unbranded because the one they're testing right now looks terrible - with image results down the page next to the main results - and no doubt it would sully Google's name if more people knew.