My friend Cayce just found this, and it is genius: an online sign-up sheet. Click on that bad boy to see it in its full glory. Never again have five versions of Taco Soup at your soup swap! Never again chase down parents to paint faces at the fall festival! And I think my favorite part is that you don't have to log-in or even register in order to use it.
Yo, it's a free service; nobody's getting paid to pimp it.