Comparison on JavaBeans and ActiveX - article 
JavaWorld article (March 1997) on how to determine which component object model best suits your needs.
Armstrong's WidgetWare.com
This Windows developer's resource center contains links to FAQs, books, articles, and related Web resources for COM, OLE, ActiveX, MFC, and Win32. It is hosted by the author of several books on ActiveX and OLE.
Microsoft's COM site
Encompasses information about COM-based technologies such as Distributed COM (DCOM), COM+, Microsoft Transaction Server (MTS), and ActiveX controls. It includes tutorials, resources, whitepapers, and presentations.
Object linking and embedding with ActiveX
The Webmonkey Geek Talk column, from August 15, 1996, describes the differences between plug-ins and helper apps and explains how Microsoft's Active X differs from Netscape's plug-in architecture.
ActiveX Tutorial
This lighthearted 5-part tutorial from developer.com walks the user through all aspects of using ActiveX controls.
Developer.com
Contains resources, tools, articles, discussion areas, and events of interest to Internet/intranet developers. Directories include: ActiveX, Java, JavaBeans, JavaScript, Microsoft and .NET, open source and VRML.
Introduction to ActiveX Controls
The purpose of this topic is to provide guidelines for implementing Microsoft ActiveX Controls that interoperate well with containers and other controls. This article defines the minimum set of interfaces, methods, and features that are required of ActiveX Controls to accomplish seamless and useful interoperability.