[aberkowitz]

Note: Amazon charges 15¢ per Megabyte of data to convert and send directly to your Kindle.

If you instead input [e-mail], it sends it to your email so you can download it and put it on your Kindle.

[darkhelmetlive]

I thought the free one would only download over wifi? Or does it do both? (I have a wifi only Kindle, so no clue).

[dwwoelfel]

There is a small fee if you download over 3G. You can prevent that by setting the charge limit on your "Manage my Kindle" page to $0.

Wifi is always free. (source: http://www.amazon.com/gp/help/customer/display.html/ref=hp_l...)

[xtho]

The e-mail pops out on your desktop pc or whatever you use. You can then copy it to the kindle via usb or whatever you prefer.

[abhiyerra]

Only over wifi.