Handy-dandy web tool
Snapmania has a web-based tool for removing unwanted people from your photos. Titled Tourist Remover, it promises to clean up your vacation shots. Take multiple photos of a monument or landmark—ignoring passing cars and people. Upload your photos into Tourist Remover, and presto! The web-based tool identifies which things stay the same in all photos and which things change, then removes the transient elements.
This tool has been around for awhile…I just hadn’t come across it yet. Sure, you could do the same thing in Photoshop, but not in such an automated fashion.