http://www.pcworld.com/article/259784/wifi_and_3g_hubs_banned_from_olympics.html
The London Olympics will be the first since the launch of Apple's iPad and the explosion in iPhone apps and Android apps but there's a long list of tech devices that are banned from the Games.
You can at least partly blame the US Olympic organization from what I've read elsewhere -- part of their deal with the US TV network providing sponsorship.