Earth Day activity: Make a worm compost bin. Tips for how to make one, What and what not to feed your worms, what to do with the resulting compost etc also there's a book I want to check into Worms Eat My Garbage, by Mary Appelhof;
I'm finally going to have a worm bin that is EASY to use. I am not sure I agree with this website when it says that castings will drop down, though. I think you have to rotate the layers, harvesting the bottom each time.
The Urban Worm Company helps new vermicomposters get off the ground with the new addiction. And we also give a little help to folks who want to make vermiculture and vermicomposting into a business as well!