[chef] Chef Server - How to do High Availability?

[bradford < >]

We've decided on Chef and would like to setup a Chef Server at work.
We would also like to have high availability of this server, for
obvious reasons:  so that we can still configure if our Chef server
goes down.  The tutorials seem to be really lacking in this area and
I'm wondering if I'm missing any or if it's so simple that no one
bothers.  Does anyone know of any good tutorials (or have any tips)
for making Chef Server highly available?
http://wiki.opscode.com/display/chef/Scalability+and+High+Availability
is pretty skimpy.  Also, does Chef Server support organizations?  Or
is this something only available with the hosted Chef Sever?

Thanks,
Bradford