FOSDEM: Infrastructure as an open source project

Mageia also have been doing this from the start ( ie 1.5 years, but that's more impressive to say "from the start" ) and the code is public ( since we just started at the right moment, technology wise, we were able to separate password from core ).

http://svnweb.mageia.org/adm/puppet/

We even took the time ( even if not perfect ) to split module in 2 groupes, for the reusable one and the specific one.

AFAIK, Debian also use puppet, and publish part of the configuration ( likely for the same reason as everybody else, the need to aduit before publishing, etc ).