Links to other sites:

http://www.paleo-camera.com/

http://www.cameraobscuras.com/

http://www.gilai.com/article_23/How-to-Use-Your-New-Camera-Lucida

http://painting.about.com/od/oldmastertechniques/ss/camera_lucida.ht

http://www.camera-lucida.com/home.html (I guess you can buy your own camera lucidas, but wow, look at the price. e_e; )

http://sites.google.com/site/getlucidart/history-of-the-camera-lucida-1

Videos:

http://www.youtube.com/watch?v=tmAPtrpdoZw (Closed Caption!)

http://www.youtube.com/watch?v=tG8Ad1UVyTg (Closed Caption!)