There's a kind of display you can get in a Google Base products search which shows only your own listings, with drop-down selectors for product, material, price, and whatever attributes you created. In my opinion it's a decent showcase of your products.
Here's an example:
Mystic Gem Creations on Google
It's not that easy to find though for a given seller. What do you guys think about it? Would it be worthwhile to distribute the url in emails, signature line or websites? Is it another google blind alley, or would you expect google to develop and promote it eventually?
Bill