We are developing a project to migrate 8000 NT's in Spanish public administration to Debian Woody, the project is named RHODAS. We are using a woody system adapted to our needs, we have our own repository and a different method of installation, you can find a document about it (by now in Spanish) in: http://es.tldp.org/Articulos/0000otras/doc-proyecto-rhodas/doc-proyecto-rhodas/book1.htm
We will have a big Debian network base, our servers actually run Debian too (over 200). We have chosen Debian because of stability, functionality, level of development, flexibility and adaptability.