Gadget Lab reports the Nick Sayes has created an iPhone application called Shakeit that emulates an instant film camera like the Polaroid. Shaking the iPhone helps develop the photograph you have taken.
Shakeit is an iPhone App from Nick Sayes which combines the slow-developing, whacked-out colors of the Polaroid with the shake-tastic abilities of the iPhone. The result is a photo that actually does develop faster if you "shake it like a Polaroid picture."
Nick Sayes' Shakeit website can be found here and the iPhone App can be found on iTunes here. There is a free version called Shakeit Lite and a full version that retails for $1.99.