You may notice a slight change in NetGalley when you next log in: where's my Kindle button? Due to changes in the way Amazon's personal document delivery service works, we've had to temporarily disable the Kindle button. All of our other reading options will still be available, in accordance with what the publisher enables for each particular title. (This includes our Quick Browse web-based reader, and support for the Barnes & Noble Nook, Kobo Reader, Sony Reader, your computer, and the iPad and iPhone!) Stay tuned; we'll be working on a way to reintroduce this reading option just as soon as we can!
I don't understand why they stopped. So far as I know there's no charge for them to send the content; the recipient pays for it. Maybe whatever they do to automate the process doesn't work at the moment. But I don't see how; it's just an email with an attachment.
Update: One commenter remarked that Amazon have started checking the validity of the from email addresses for emails sent to Kindles. The trick of faking a valid from address no longer works.
On the other hand, maybe they're going to start using the Kindle's new lending system. That could be interesting. I don't see how it would work, but that could be interesting.
I'll see what I can dig up. Someone remind me about this next week.