Around the Detroit metro area Ritz Camera advertises this service. I've never used them myself, but you could call them. It shouldn't be too hard to rig up one of those telecine devices... it's just a beam splitter in a box. If you still have the projector and a good size screen, you can just project the movies and shoot them with a camcorder. If you keep the camera axis close to the projector, you can minimize the keystone effect you get when shooting this way. -- that's the advantage to the beamsplitter approach, you can align the setup properly.
