Demo/dns is pretty old, and has been superseded by Anthony Baxter's pydns project on SourceForge. At the very least, Demo/dns/README should point to http://sourceforge.net/projects/pydns instead of Anthony's old page for this project (dead URL).
More radically, we could delete all the code in Demo/dns, and just leave behind a little README pointing at Anthony's project. I've *just* checked out his code, haven't dug in seriously yet, so I don't know if this is a good idea yet.
Opinions? If I hear nothing, I'll just fix the URL in the README.