Watch the Mariners on your DS while you watch them in real life.
Though the pilot program has been going on for some number of months now, Nintendo is finally promoting the testing of their "Nintendo Fan Network" at Safeco Field, home of the Nintendo-owned Seattle Mariners Major League Baseball team.
After downloading a small application from a kiosk, the network lets baseball fans use their Nintendo DS to get a feed of real-time stats on the game. Additionally, fans can stream replays of the game off of television feeds that are not available on the stadium's own replay screen. A trivia-game keeps fans entertained when the baseball game isn't. Finally, the network also gives users the ability to order food and drinks, and have them delivered directly to their seat.
The cost of using the network is $5 per game, or $30 for ten games. Nintendo is hoping to expand the network to other MLB stadiums in the future.