ATL COM and ADO
Jan 2001 - Amit Dey
This article shows how to use ADO from ATL COM components.
Beginner's Tutorial: COM/ATL Simple Project
Dec 1999 - C. Lung
This article shows how to create a COM object using ATL and then how to use it.
COM, all you need to know to get started
February 2001 - Francis Shanahan
Dr. GUI and ATL
Nov 1998 - Dr. GUI
This article show very good how to create COM components using ATL.
Dr. GUI and COM Automation
April 1999 - Dr. GUI
This article is interesting because it explains how the different variable types for COM objects work.
Dr. GUI on Components, COM, and ATL
July 1998 - Dr. GUI
This articles talks about COM objects and how to use them. It describes COM very thuroughly. However, despite the title the article doesn't talk about ATL.
Using the Windows Template Library
Jan, 2004 - R Mack
This article shows how to create and manage a window using WTL.
The Component Object Model
This article gives a good overview on COM and its specification.