This is how it works- you sign up here, then shoot a roll of film. You ship that roll to your partner, and that person will develop it. You'll also be getting a roll of film in the mail. You develop that roll and share those photos on your blog or flickr.
These are some photos from previous swaps. Last year I traveled the California coast so most of my swap pictures were from that trip.
All photos from photoswap 2011- you can see more pictures here.