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;
Gardening Tips: How worm composting works! A Worm Compost Bin accelerates the composting process through activity by the worms, and it is easy to manage. The Worm Factory is designed to support all of the benefits or worm composting! | GardenersEdge.com
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.