also, if you dont have access to a cam, or want to stay somewhat anonymous, as in not record your voice and/or show a picture of yourself, then you can still have your say by using something like this simple rebol front end to a text to speech engine.
http://www.rebol.net/plugin/demos/new-demos/speak.html
and then save it off as a wave sound file once you have tuned it to speak properly (phonetic spelling sounds better for some words etc)in the voice of your choice.
i would suggest you also include some static pictures to make your final anonymous "Video Petition", "video protest" (anyone know of a good free app for taking the wave and including pictures to make your video from windows and linux ?).