Great idea, sadly it does not work with WP E-Commerce

This would be a great plugin if it actually worked. And, you would think since there is a commercial company attached, they would care. But, it has not worked for over two months. It is not compatible with the last few releases of WP E-Commerce. Hopefully the company will eventually care enough to make the small updates needed on-time. You cannot expect people to use a commercial service and not provide up-to-date software.