GoodRelations Shop Extension for Joomla / VirtueMart
... an extension for VirtueMart, the popular Joomla shopping cart solution, which creates GoodRelations feeds (GoodRelations e-commerce vocabulary) of product offerings and thereby adds additional visibility and ties to your product sites by introducing Semantic Web capability (aka Web of Linked Data).
I just released a second version for this extension in July 2010. The project Web site is located at http://code.google.com/p/goodrelations-for-joomla/.
The latest code commit stems from August 11, 2010.
The GoodRelations ontology is currently supported by the Semantic Web search-engine Yahoo SearchMonkey.
Demo
Demo Shop main page with company profile in RDFa
Demo product page containing RDFa
PDF: 
411 KB
GoodRelations Shop Extension for osCommerce
This extension enhances osCommerce by Semantic Web functionalities.
The Semantic Web information, that can be used by search engines like Yahoo Searchmonkey and other Semantic Web pages, basically consist of RDF/XML output and RDFa, that is, embedded RDF code in XHTML attributes.
The project is based on GoodRelations, a product ontology developed by Martin Hepp at the Bundeswehr University Munich in Germany. More precise, GoodRelations is a lightweight ontology for annotating offerings on the Web.
More details on GoodRelations are available here.
The project Web page is located at http://code.google.com/p/goodrelations-for-oscommerce/.
Demo
RDF/XML dump
dataRSS feed
RDFa
PDF: 366 KB
GoodRelations Enhancement for the RDF Book Mashup
The famous RDF book mashup by Chris Bizer from the University of Berlin implements many concepts of the GoodRelations vocabulary.
The RDF book mashup demonstrates how Web 2.0 data sources like Amazon, Google or Yahoo can be integrated into the Semantic Web.
The RDF book mashup makes information about books, their authors, reviews, and online bookstores available on the Semantic Web. This information can be used by RDF tools and you can link to it from your own Semantic Web data.
(taken from: http://www4.wiwiss.fu-berlin.de/bizer/bookmashup/)
From the following link you can download and install the Search Engine Plugin for the 
Mozilla Firefox Browser 3.
