Google has got a special doodle celebrating Doctor Who's 50th anniversary, Choose which of the 11 doctors you want to play as. It's a series of short games, the objective being to collect the Google letters which have been stolen, and then return to the Tardis to get to the next game, trying to avoid the Daleks, Cybermen and Weeping Angels.
http://www.google.com/doodles/...sary?doodle=10152301