Both of these blogs serve the web-going public in vastly different, but equally important ways.
The first is Found Cameras and Orphan Pictures at http://ifoundyourcamera.blogspot.com/. People post pictures from cameras they've found, as well as the place they found it. It's a great site to check out if you've lost a camera in the Plaza, or if you get a kick out of candid shots of strangers.
The next is PostSecret, where people send in artistic postcards with secrets printed on them. Silly, sexy or sad, it's interesting to read these secrets every Sunday and get a peek at the innermost thoughts and motivations of strangers. The blog has even put out a book of some of the best or most artistic secrets.
Let us know about other useful sites and blogs!