Servizio Informativo Comunale, Comune di Riva del Garda, ITALY
We are using Debian on half of our servers (6/10) since 1999 and we are planning to migrate others on this platform. We're using it for firewall (shorewall); dmz zone servers (web, mail, ftp); internal services as database (postgresql), fax (hylafax), dns and some custom services.
We are very proud to use them and we are very happy end users: thanks to all teams involved into Debian development!