Michael Peel, 03/04/2013 12:43:
Thanks Nemo - that's a very useful link. It's good to see that there's a number of "merge w/ internal" comments/suggestions there, which would make a lot of sense to me.
Disclaimer: I didn't add those notes. :)
Second technical note: a merge from a private wiki to another is very simple, because you don't have to check for confidentiality. For small wikis without files it's just a matter of Special:Export and Special:Import by a user with sufficient rights. Pages can be imported into a new namespace to avoid conflicts and to add namespace-specific user permissions if needed. Sysadmins are able to do it right, the only missing piece being the logs; it was recently done with wikitech-old merged into http://wikitech.wikimedia.org .
Nemo