There are those services out there that really help you be productive like gmail or remember the milk, services that help you keep up with all your friends and the latest stuff like twitter and friendfeed, and then there are those services that are just fun.
Daily Mugshot is one of those fun little services (at least I think so). Basically all you do is post a picture of yourself every day and then as you add more and more pics you can share your mugshow which is all your shots combined almost like an old school flip book.
You can of course add friends to follow to check their daily shots as well as you can either email, use a webcam, or take your pics with your mobile device.
Like I said its not a service that is gonna change your life or help you be productive….its just fun! Check out my mugshow below (after 8 days using the service).

If you are using the service make sure to add me as a friend and I will add you back.
[added note] I almost forgot to add you can setup Daily Mugshot so that it posts a twitter message for you each time you load a new mugshot alerting your friends to check it out.