I am very much confused about implementing rich snippet. My mind arise some basic queries regarding Rich Snippet as : how to implement rich snippet code in web site / web page; is it necessary to design web page in Microdata. Because I found
In order to be eligible for rich snippets, you should mark up your site’s pages using one of three supported formats: Microdata Microformats RDFa
It's not exactly a redesign. The page's appearance an be exactly the same.
Instead, it's additional mark-up within your existing source code so the various elements of your page communicate more detailed semantic information that search engines can use - and who knows what else in the future if they really catch on.
Here are some of the many threads on WebmasterWorld about it: