IF you ALSO own an I-phone, I THINK you can now do some changes to your kindle through some synching, but this is all brand new. My bet is that in a couple of months, your kindle will have tons of crap that you can add/change when the I-phone tekkie boys start tinkering around.
Try a google search for kindle app store.
I think Amazon should give the damn things away, btw.
Awfully pricey, even though I do habla the business model. The price for the "books" is attractive.