If you’re selling products on the internet, you need to be involved with Google Base:
http://base.google.com/

What is google base, you ask? It’s the only free, as far as I know, product search engine on the internet. For the good web marketers amongst us, you probably knew it previously as Froogle. These days, Google Base has found a home for millions of products. Everything from home furnishings to electronics, environmental awareness posters to automobiles. You can find it all on google base.

There are a few specific advantages to including your products on google base:

• I noticed that on products we feature in google base, their natural results are higher than products that aren’t. I can only assume that this is because google itself is vouching for the items, as they are part of another google program.
• On top of any paid or natural search results you may be a part of, you’ll now have a separate data stream which can be picked up by google and other product engines. Within a month of posting to google base, I found our products appearing on shopping.com and a variety of other shopping engines.
• The google feeder allows you to customize content specifically for their listings. You choose which products appear in your feed, and with what content.
• Google Base is FREE, and you only have to update your products once/month to keep them in the current listings.

So what’s the downside to google base? To be honest, I’ve yet to find one. It’s a good business decision to put your products out on google immediately.