Component Object Model
A brief overview of COM, by Gopalan Suresh Raj.

COM Threading Models
An introduction to the different threading models in COM, by Gopalan Suresh Raj.

COM, DCOM, and Related Capabilities
An evaluation of COM architecture, by Software Engineering Institute, Carnegie Mellon University.

Building COM Components on UNIX
Discusses DCOM on the UNIX platform. It covers platform compatibility issues, the UNIX-specific architecture of DCOM, and implementing a DCOM component on UNIX. By Christian Gross, euSOFT.

Microsoft Component Services - A Technology Overview
A whitepaper introducing COM, DCOM, MTS, IIS, ASP, MSMQ, and COM+. By Microsoft.

CodeMarine Tips from the Trenches
Tips from the bi-monthly free mailing-based newsletter covering tips and coding insights. By CodeMarine, Inc.

The Joy of Reference Counting
Discusses referencing counting in COM, and briefly contrast with the approach taken by CORBA, by David Chappell.