I use randomisation of content entirely for human users:
http://www.comparative-religion.com
Refresh the page, and right hand boxes change. It's simply to draw user attention to different facets of the site.
As for this example in particular - of course, there is a good argument to make that it's made for spiders.
However, I persoally would not expect randomised content to have a significant impact on any kind of competitive search terms. I also have serious reservations about using randomised links with a Google sandbox around.