OMG! and yes, i really do need to use that phrase.. how totally excited was i when i discovered:
Fotoffitti an app that let's you i/phone/pod/pad your image as a graffiti artwork. Exclamation marks necessary indeed!!
Here is what the photo (shot via my ipad) looked like first..
Then you shake to spray, choose your wall, contrast AND how old you want it to be.. now if that isn't app developing at it's best then i don't know what is. Stencil art without the pain!