My new favorite Flickr photostream to stalk is mrwaterslide. A collection of found photos from the earliest photographic portraits to 60s polaroids, there's a little bit of everything to be discovered; creepy turn of the century children, happy couples, pretty girls in pretty dresses and an occasional animal or two. Many of the photos contain background information on the subject, some factual while others have stories made up to go along. There's even a countdown of the top 100 photos for the past couple of years. Seriously, I could get lost in there for hours.