The iPad edition of Madden NFL 11, however, lacks multiplayer. EA says that multiplayer is coming in a free update, but it's still too bad that it couldn't have made the coin toss.

Also in the minds of NFL teams, of course, is security. There is always the danger of loss, copying, sharing -- whether it's an iPad or a giant book with your plays in it.

It remains to be seen how deeply the iPad will penetrate the NFL, but it is emerging as a versatile, and vital, tool within the league. Five teams outlined to Wired.com exactly how they have ...