I've been meaning to do this for a long time. It is a neat little project that allows for a quick and satisfying mixture of electronics and astronomy. It has been described on the web many times: Take an old web cam (preferably one of the old eyeball-looking devices) and remove the lens (I found it very cool to expose the charge coupled device).
Take a plastic 35 mm film container (hurry, while supplies last!) and chop off the bottom. Tape the container to the sans-lens webcam. Here's the fun part: Insert 35 mm container and webcam into the focuser of your telescope. Bring laptop out to the telescope and take digital pictures with your telescope.
I used Billy's old Asus eeepc and a very simple program called Cheese. (There has got to be something better for this kind of work.) But my results were very good. Last night I got images of Jupter and two of its moons. This morning I got some great shots of our moon.
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics"http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20