I recently created a Google Base account to boost my Etsy sales. Essentially Google Base is an online database into which a user can add content, including items on Etsy. With an account you can upload your items from the RSS feed of your Etsy store and schedule them to be refreshed on a daily, weekly or monthly basis. When a buyer uses Google as a shopping search engine they will pull relevent items from this "base" and your items will appear in the results. Stained glass seller, Go to Great Panes has posted an extremely helpful blog for creating a Google Base account here. It is worth the 10 minutes for the many exposures you can create with it.
***On a special note: This is a beta version, so rules for this database and Etsy will change in December 2009. Keep your eyes peeled for updates!