I get lots of email asking why I am taking (and posting) a picture of a door every day. This phenomenon started in 2004 and has morphed into an international project entitled Project365. The original goal was to document each day of a year of your life in photos for reflection on the passing time. I am not sure where the actual official Project365 page is located, but this may be it!
There are many different flavors of this project. Some people participate in Project365 groups that assign them a type of photo to take each day ("Take something yellow." "Take something that contains an equilateral triangle." "Take something that makes you feel happy.")
Others of these Project365 groups concentrate on teaching the participants to be more effective photographers by providing photography instruction and methodology in the day's assignment.
Other people, like me, pick a theme and carry it out in photos throughout the year; hence my door project, which you can view below. (For a much better experience, link to the full MobileMe gallery here.)
Here are some links to places you can find postings of Project365 photos. (BTW, I am not responsible for any content that you see that might be inappropriate!)