One of the great things about developing new software at Microsoft is working with the folks in MS IT (formerly OTG, ITG, ...) who develop/manage our internal apps. They have a passion for dogfooding that really makes the products better. We didn't used to talk much about this in public until IT Forum a couple of years back when there was an entire MS IT track. Currently there are articles on MS IT and SQL Server in SQL Server Magazine and also on Microsoft.com;
Overview of SQL Server 2005 Usage
Migration to SQL Server 2005
SAP and SQL Server 2005
Security and SQL Server 2005
Document Management and SQL Server 2005
Encryption and SQL Server 2005
Revenue Analysis and SQL Server 2005