Cell phones are now being used at pro sports stadiums in an interesting way. Thanks to BusinessWeek Jan 9, 2006 edition for this one on Cell Phone Sports. Imagine that you go to watch your favorite pro sports team, and you can vote on the songs that are played and send messages to the scoreboard all by texting on your cell phone.
FanDrive Media out of Altanta has done this already at many stadiums, and is working with the NHL and the NBA right now to develop a business model. I think this is a creative way to capitalize on the already 100s of millions of cell phone users.