You can get more information about Microformats at http://microformats.org.
Operator was developed by Michael Kaply at Kaply Consulting, and is a featured project of Mozilla Labs.
You can use Operator to debug your microformats. When you turn on debug microformats mode and debug mode in preferences, you'll see a new handler called "Debug" that shows different views of the microformat.
If a microformat doesn't show up, but you believe there is one, it might be because the microformat is invalid. You can turn on debug mode in options to see invalid microformats.