The Catch in Kindle’s Data Plan - Digits - WSJ

I suspect this analysis ignores the Amazon Silk technology, which may be increasingly strategic, now that Amazon is going to offer a wide-area-wireless Kindle Fire device

"The plan buys 250 megabytes of data a month. But if you want to view 30 or more Web pages, or stream more than four minutes of video, or listen to more than 20 minutes of streaming music per day, that isn’t going to be enough.
Watching a single two-hour HD movie would use up 614 megabytes, according to AT&T’s data calculator. A 1.5 hour HD movie would use up 461 megabytes. What happens if you go over? AT&T turns off the service until the next month – which means a long intermission."

The Catch in Kindle’s Data Plan - Digits - WSJ