Simon Strandgaard wrote:

> Is anybody aware of other services which does perfect mirroring (except NSA)?

No one has yet suggested Gmane, maybe there is a good reason for that...
I don't have any information about it's perfectness, but currently 5615
mailing lists are using Gmane. See http://gmane.org/ for more information.

The downsides I'm aware of:
  * comp.lang.ruby would change its name
  * Google wouldn't archive the newsgroup
  * News users would have to add a new server in their reader in
    order to read the group

-- 
Tanu Kaskinen