KMLProxy in our forums brings up a good point, if you're looking at purchasing an Amazon Kindle Fire. You won't be able to easily transfer apps that you purchase in the Android Market to the Kindle Fire. That is, you won't be able to redownload them directly, because the Kindle Fire won't have the Android Market.
That's not an insurmountable problem -- we've talked about how to pull the apps off your phone before, and you should be able to sideload them back onto the Kindle Fire. But you do see what we're getting at here, right?
Will the absence of the Android Market sway your decision to purchase a Kindle Fire? Let's hear it.