One of my favorite sites while we're on this topic is
John Stone Fitness. It isn't really a business type blog or anything, but a health/fitness website. The admin, John Stone, started posting his pictures to the world on January 6, 2003 being overweight and out of shape. If you visit the site, you will be amazed by his transformation. He took a picture of himself, every single day, for I think ~400 days. He also has it in a .gif format so you can watch his body change over a 1+ period, in 30 seconds! He now takes pictures every month, and at random times, and the community through the web forum has grown tremendously. Very nice if you're looking for information on fitness!