Welcome to klozoff.ms11.net (which may also be klozoff.org if I ever set that up)! I'm Steve, although sometimes I go by Oliver Klozoff.
Anyway, I figured it would be nice to put a page here so search engines could find it. So here's a list of the things you can find on this site:
Anyway, some interesting examples (not all of them work right, which is why I omit the word 'good'):
Hovering over them in Mozilla or Firefox should popup a list of interfaces supported by each class. Red classes crash Firefox. I filed a bug (see below), but the mozilla people didn't consider it a bug and refused to fix it.
Several classes are intended to be accessed with GetService instead of CreateInstance. If you use CreateInstance, the browser dies a horrid death.
I used this file to generate the xpconnect-classes.xml file
Maxstream makes neato little radios called XBees. Here's everything you'd ever want to know about their bootloader: XBee Bootloader Info