Nintendo's new game console is the Wii U, and this holiday shopping season they've been pushing a deal of a console that comes with a Legend Of Zelda game (Yes, I spoil my kids rotten, but it keeps me in hugs). The game doesn't come on a disk, but is downloaded from the Nintendo servers. Which have been down all day.
It seems that lots of people got these consoles for their kids and everyone hit the servers at the same time. And so the servers are doing an excellent impression of the Healthcare.gov exchange.