Magento

This functionality allows you to put products in Google base; once in they will show up in Google shopping search results.

First, you will need a google account and register for google base.

http://www.google.com/base/

Next you need to add the login details into the magento backend at

System → Configuration → Google API → Google Base

Now you are ready to think about mapping the magento product description fields to Google base.

This you do in the Magento backend here:

Catalog → Google Base → Manage attributes