This one can be expanded to selling anyone on an idea:

• A must read article on “How to sell your boss (on an idea)”

The usual set of MSDN articles:

• Report-enable Your Web Apps with Microsoft Reporting Services
• Customizing MSI Installation (with Visual Studio installer projects)
• VB-Helper: Stick to the Script (script integration with .NET)
• Internal SQL Server Diagnostics Tools, Part 1: PSSDiag

Some notable downloads:

• Do-It-Yourself Script Center Kit
• Microsoft® Windows AntiSpyware (Beta)

Finally, a couple of excellent articles by Michele Leroux Bustamante (dasblonde)

• Sandboxing Components for Impersonation
• Designing Role-Based Security Models for .NET