More Google Easter eggs beyond the barrel roll

So we showed you what happens when you search for 'do a barrel roll' on Google.  It's a good start; but what else is there in the field of search engine-related procrastination.

What some may know but most do not is the fact that this is one in a very long stream of quirky features that the absolute nerds up at Mountain view have incorporated.  So, to lift the veil, here's a list of the best: