Blackberry Playbook

Is there a cable or a method to upload photos from my D40 to a Blackberry Playbook

The Blackberry Playbook has a micro USB port so you should be able to download from your D40 to it. With the right USB cable and connection.

Not quite sure how the Eye-fi cards work but it would seem that they might be an option as well as they claim t be able to connect your camera to your smartphone.

oops - seems it may just be Android & iOS.