You can't share books via SD card swapping. If the Kindles are on the same account, you can each download a copy of the book for no extra charge.missajeep said:I'm upset about the SD card. My MIL was going to share her books with my Husband and I via a SD card. Now I'm not sure what to do. My husband wanted to store the books on an SD card in case something went nuts with the amazon site. Now I've got to figure it all out. You would think that making us wait for our orders we have had placed for months they would have at least thrown in a free case for us or something. I also don't like that the K1 owners get priority over our very early orders.