Which
Great Microdata Resouces
Testing Tools
- Google Rich Snippet Tester: http://www.google.com/webmasters/tools/richsnippets
- Structured Data Linter: http://linter.structured-data.org/
Good Resources
http://www.seomoz.org/blog/the-lowdown-on-structured-data-and-schemaorg-your-questions-answered
Google Support Pages
http://support.google.com/webmasters/bin/answer.py?hl=en&;answer=146750
Google Blog Posts
http://googlewebmastercentral.blogspot.com/2012/04/updates-to-rich-snippets.html