Just in case you didn't think WP e-Commerce was awesome enough already. I want you to check this out. It is a relatively new community made Plugin put together by BraveNewCode, our friends behind the famous WPtouch Plugin.
Check our Piggy. Your WP E-Commerce sales, in your pocket. Piggy is a web-app that provides mobile access to view sales data for your WP E-Commerce powered WordPress website. Works on iOS and Android.