Google is celebrating the 30th Anniversary of Pac-Man's release (May 22nd, 1980) by replacing their normal homepage logo with a Google-styled Pac-Man board.  Google has created these "doodles" for a number of holidays, but for this commemoration, they've pulled out all the stops.  This logo is actually a fully playable Pac-Man level, complete with classic sound effects and advanced behavior such as cornering and ghost pass-throughs.

Head to Google, hit "Insert Coin," and use your arrow keys to play.  Watch out for those dead-ends!