So example.com, example.de, example.fr, etc?
more: species-id.net, offene-naturführer.de etc.
We don't have any good way to share sessions across domains with a shared user db. I did have an idea for an extension that would fix that as a side effect, but haven't got round to implementing it.
thanks for the answer, a negative is useful here as well.
So our best bet would be: http://www.mediawiki.org/wiki/Extension:CentralAuth = possible but difficult to get running?
Gregor