Update: Tumblr for iOS is now completely native. After updating the Tumblr application for iOS (and coming across Peter Vidani’s Dribbble shot), I decided to take a stab at seeing how it worked. I ended up using both Crunch (for resource files) and Charles (for network traffic). There’s no real voodoo involved to see how things fit together — most of what I did is covered in this NSScreencast epis