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