The idea behind The 52 Week Photo Challenge is simple. All you have to do is take a photo based on that weeks theme and post it up somewhere for others to see. The good thing about this is it doesn't matter what kind of camera you have or how experienced you are, you can even take up the challenge using the camera on your mobile phone. You can create a blog to post your photos if you want but you don't have to. You can just as easily use a Flickr or Facebook album so long as you make it accessible to others to see. The main aim is to have fun and have a reason to take at least one photo each week.
Full details can be found at The 52 Week Photo Challenge