I went to two MSFT presentations recently:

Step by Step Windows DNA on Windows 2000

(excerpt)
How Microsoft Tools and Technologies Fit Together to Build Distributed, Web-Enabled Applications on Windows 2000
Introductory Techniques and Best Practices for Building These Applications
A Simple, Step-By-Step Demonstration of Building a Windows DNA Application

Hitchiker's Guide to COM+ Part 1

(excerpt)
COM+ Overview: COM+ Is:
A Runtime Environment for Components
The Evolution of COM and MTS Combined into a Single Programming Model, Shipping in Windows 2000
The Distributed Transaction Coordinator (DTC)
An Administration Tool
System Services for Distributed Applications
Data Access, Scripting, Transactions, etc.

COM+ Overview: COM + MTS + Services = COM+
COM+ Preserves Current COM and MTS Investments
COM+ is based on COM
COM+ embraces and extends MTS services
COM+ Makes Building Server-Side Components Easy
COM+ Provides Benefits Across Multiple Languages and Tools

The PowerPoint slides can be downloaded from http://www.microsoft.com/southeast/business/files.htm if anyone is interested.