Clay Shirky on WiFi vs 3G:
"The second problem is that 3G services don't just have the wrong prices, they have the wrong kind of prices -- metered -- while Wifi is flat-rate. Metered data gives the user an incentive to wait out the cab ride or commute and save their data intensive applications for home or office, where sending or receiving large files creates no additional cost. The more data intensive a users needs are, the greater the price advantage of Wifi, and the greater their incentive to buy Wifi equipment. At current prices, a user can buy a Wifi access point for the cost of receiving a few PDF files over a 3G network, and the access point, once paid for, will allow for unlimited use at much higher speeds."
Boo-ya-ka-sha Shirky-san.

B