microformats
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tutorial
About rich snippets and structured data Snippets—the few lines of text that appear under every search result—are designed to give users a sense for what’s on the page and why it’s relevant to their query. If Google understands the content on your pages, we can create rich snippets—detailed information intended to help users with specific queries.
Marking up structured data - Webmasters/Site owners Help
Value Class Pattern
The value-class-pattern solves two of the three most challenging issues that microformats have encountered in their entire history: accessibility and localization. After many long months of focused iterating (repeatedly researching, brainstorming, testing, documenting) led by Ben Ward , the value-class-pattern alpha draft is ready to use and support. Publish and implement
“If you want to inform yourself of the basic principles of attention profiling or need to explain the concept to others then please read on.
Basics of Attention Profiling through APML