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It looks like Google is going to enter the eCommerce market. My basic understanding is that Google will be allowing people to upload product information to Google Base and then when Google Payments is released they will be able to set a price for those items and accept payment.

There is no indication of how fulfillment will be handled, but it does sound like there will not be a transaction fee. I would imagine there is also not a need for a merchant bank account.

While this won't work for clients with larger eCommerce aspirations, it should be a decent option for entry level shopping cart services. Especially is there is a web service to interact with the store contents.