Originally Posted by DiapDealer
Actually, you can get non-Amazon purchases to sync (Furthest Point Read only - no notes or bookmarks) between multiple devices, but you have to be willing (and able) to fiddle with the metadata -- and it has to be an ebook that Amazon does sell in order to work.
If the ebooks (on the multiple devices) share a valid Amazon ASIN number (EXTH Record 113) and EXTH record 501 (cdetype) contains the value 'EBOK' (rather than 'PDOC'), WhisperSync will happily keep track of your "Furthest Read" point on the various devices.
So are you're saying that a book I may have purchased from another site ("Girl with the Dragon Tattoo" for example purchased from the Sony site) can be synced if I convert it to mobi for my Kindle, as long as I change the metadata values? That would be really groovy, if I understand correctly!