The Vacationeers, whose YouTube video of Google Maps was a huge internet hit, have now been hired by Google themselves. Google have hired the team to create comedy videos of a number of the company's products.
Here's the original video, Google Maps (Part I of "The Googling")
My favourite YouTube video at the moment, however, has to be this altered version of an REM song. It's called 'Map Of The World As We Know It'.