Looks like this thread might be winding down, but I can't resist jumping in to say that Ockham's jiggle script has worked very well for me.  Now, it is true that the version of jiggles I run is customized, as are the magnets I use to achieve the jiggles effect, but the results have been very satisfactory, at least to me.  And for an animated clip of any significant duration, I can't imagine keyframing jiggles by hand.

Though I'm sure it won't cause Pixar to come knocking on my door, I'll try to post a small avi or flv one of these days so others can see how well Ockham's script works.