Older Canon EOS cameras do not have a video function, but EOS Canon Movie Record looks like a nice hack that will let you live stream what the camera sees into your Mac for recording, video-only. (Hat-tip to Jordon in my advisory who found it.)
Hardware
GoPro Hero2
Manual is here.
[youtube http://www.youtube.com/watch?v=CMHnSx0Eyto]GoPro2 getting cheaper

GoPro Hero 3 is out, and looking amazing, but that means that the GoPro Hero 2 is now $100 cheaper — $199. Maybe somebody loves you enough to buy you one?
Slider camera shots on the REALLY cheap
[vimeo http://vimeo.com/34642325]
We don’t have a Kessler Cineslider ($1195) and a Revolution Head ($1895), but we have laptops ($free) and toilet paper ($free) and table ($free) to make a slider for your cutaway interview: ball up four 4-inch pieces of toilet paper, put one under each corner of your laptop, and slide away. S L O W L Y. Maybe with a push stick.
Good (unembeddable) slider short is here.