Here is a video demonstrating the vibrations from an SLR (Canon 7D).

http://vimeo.com/22878525

My observations:

•Hand held completely covers everything else (except the shutter finger).

•Shutter only isn't much (if any) different than with the mirror slap. (Considering that shutter 'open' and 'close' seem to be two separate actions in the last one.)

Terry