Active X

Books

ActiveX Programming Unleashed - the book

Free Active X Books - Get Free Books On Active X Like Active X Unleashed

Active x

Websites!

Microsoft - Well, they made it after all...

The (unofficial) ActiveX Guide - A good overview of ActiveX.

ActiveX.com - The ActiveX control source.

Browser Watch - Here is where you find the links to all of the best ActiveX Controls available on the net.

Gamelan
Absolutely hundreds of ActiveX controls and examples here, this site is a massive resource and is probably (in my opinion) the best place to find a lot of easily downloadable ActiveX components. Also has a lot of non-ActiveX stuff here. However, for some unknown reason, I got pissed off with this site after about 10 minutes.

ActiveX.Com
Excellent site for ActiveX components to be downloaded from. Rates the components it recieves and uses a couple of neat ones on its site too. Also has some hints on how to create your own ActiveX controls.