|Don't ask to ask, just ask|
This is an interesting idea, though I expect it would take a bit of work.
If pursued, I'd recommend hiding the Chatterbox and the Other Users nodelets, given the previous discussions regarding CB logging and the fact that google hits include the CB.
Alternatively, you could hide all nodelets on the "id" server, thereby providing a convenient way to nicely print nodes without having to hide the nodelets yourself.
In fact, you could even detect whether or not it's a (common) robot/spider and, if so, redirect them to the "id" version of the node, thereby (eventually) removing the current CB "logs" in google's cache.
I know you couldn't get all of the robots, but you could certainly get most of them.
Again, I realize there's some work (and therefore time) involved, but it might help raise awareness of the site, increase traffic, etc., etc.