Google integrated a PacMan game into their logo to celebrate Pac Man's 30th birthday. The game is playable as you can see here:
Apparently there is also a hidden joke included in the game. The app will run on the iphone as well as as Macs and PCs. This could be a subtle shot at Apple considering the app runs on iphones but was not purchased through the itunes store and was of course not written in the EVIL Flash. For more on this click here.