Tell us about yourself!
I could have sworn I saw a TED talk years ago demonstrating a tool to do this automatically.... I've been searching the web for it ever since and I can't remember the name. Does anyone know? In the talk, they did a demo where the people weren't right next to each other... but they just lassoed a person, clicked a button, and the person was gone, the image filled in perfectly and believably behind it....
Fixing Holes in Dry Wall - The Perfect Patch Method