Originally Posted by SCION
Hi, Amazon books only work with Kindles.
This is true, but only to some degree. I have a Sony and constantly buy and read Amazon ebooks for it and on it.
You can achieve this by either rooting your PRS-T1 and installing the kindle app on it or by buying and downloading amazon books with your PC, free them of DRM (google Apprentice Alf) and then transfer the book onto your Sony (or any other ereader) and read it with the regular reading app.
Both maybe sounds scary, but believe me, once you know the trick, it's really quick and easy.
There is ample information in the wiki (see my signature) and you can always ask in the Sony forums here for help.
PS: Also, be aware, that the fire is NOT an eInk device: More eyestrain (at least for me and many others) and much shorter battery life.