I am curious as to the background to Keith's statement that "This hair-of-the-dog approach is troublesome on moral grounds...". Is it immoral to probe for ports? Why?

As far as providing a list of open relays for spammers to exploit, this is similar to identifying security holes. While one might argue that keeping security holes secret if there is no practical fix to the hole, it seems obvious that publically identifying holes (and spam friendly sites) provides the motivation to apply the easy (trivial?) fixes necessary to close them.

The published policies of ORBS and MAPS are not inherently in conflict.

The behaviors of both seem to have been outside of their own policies.