File this under "Completely useless, but really cool"
There's a guy in Britain who is working on turning the old Game Boy console into a web app. He's using Java and HTML5 to make a web browser emulator, and is working on the old classics like Tetris.*
Will this wind up being another time and productivity sucking app, like the Google Packman doodle was? Probably. But its still really cool!
*Yeah, we know, you can play Tetris lots of places now. Don't be a buzzkill.