A reader named John says he "saw this bench at the car wash in San Diego, CA a few weeks ago and thought of street use. Apparently they dont want their bench stolen."
It is actually a pretty cool design. It makes the bench heavy and awkward to move. Yet it doesn't detract from either its use or its looks (too much). And it is probably cheap to make. Also it can easily be applied to a variety of bench types. Why don't we see this solution more often?