This is a shorter term project than the previous film project that came up in here that's supposed to last a year, and I feel like it could be used as a trial session for that. Only in this project, you really only have one roll of film. That means 36 frames (12 if you're shooting Medium format. Let's make it 3 if you want to be really cool, show all of us up, and go with large format)
Rules are simple. Load your camera one day, don't change your lens, and 7 days later, get that film developed and ready to show off.
Don't post all of your photos - just the ones you most enjoy, and perhaps create a flickr album and link it in for those who want to see the remaining shots you captured.
You can start at any time that you wish, just perhaps post the date period within which you took your photos? Doesn't really matter, just try to follow the rules. Have fun. Enjoy yourself. Be stoked on film.