This mod adds a markup scheme using microdata from the Schema.org

What Schema.org?

Schema.org - a standard semantic markup data network, announced by the search engines Google, Bing and Yahoo! in the summer of 2011.
The purpose of semantic markup - make the Internet more intuitive and structured to facilitate the search engines and special programs, the extraction and processing of information for easy submission to the search results.
Yandex from autumn 2011 understand this format, and supports it in some affiliate programs.
The markup is directly in the HTML-code pages with the help of special attributes and does not require a separate export file.

Microdata (HTML microdata) - an international standard for semantic markup of HTML-pages, with attributes describing the meaning of the information contained in this or any other HTML-elements. These attributes make the machine-readable pages of content, that is, can automatically locate and retrieve the desired data.

Adds the following types of schemes:
http://schema.org/product:
name
manufacturer
url
image
model
offers
description
aggregaterating

http://data-vocabulary.org/breadcrumb
url
text
href
title

http://schema.org/offer
price
pricecurrency
availability

http://schema.org/review
author
datepublished
reviewrating
reviewbody
http://schema.org/rating
worstrating
ratingvalue
bestrating

http://schema.org/aggregaterating
reviewcount
ratingvalue

Install:
1. execute file from arhive to vqmod directory
2. in string <file name="/catalog/language/english/english.php">
english - change to your language
3. in string <file name="catalog/view/theme/default/template/product/product.tpl">
default - change to your template

UPD: Check this mod here:
http://www.google.com/webmasters/tools/richsnippets