Yes, it does.
I just sent a book that I did NOT purchase from Amazon to my iPad. I sent it as a mobi file (I converted it from an epub using Calibre) to my iPad's kindle address ([myipad'sname]@free.kindle.com). I sent it to the "free" part so's to ensure it went WiFi; as in, ensure I paid no fee...
After a bit, the book showed up in the iPad's Kindle app and I was able to open it, no troubles. The neat part is, sending the file to the iPad
automatically stores it in your Kindle/Amazon Archive. This meant I was able to launch the Kindle app on my iPhone and access the book from the regular Archive.
And when I accessed it from the phone, it went to the last place I was. So, I went ahead two chapters on the iPhone. Then, I closed out the iPhone Kindle app and went back to the iPad. When I opened the Kindle app, it asked me if I wished to go to the last synced place in the book. I said yes, and I was right where I left off on my iPhone.
So, yes, you can now sync books you did not purchase via Amazon's whispersync method. And it's automatic. Now, I actually prefer to read my books with my e-ink reader, for long sessions, but I really do like this idea of syncing between devices.
Oh, dear. Does this mean it's time to think about buying a Kindle - so I can easily switch between
three devices?
:Shakes fist: Darn you, Amazon!
Marilyn