Jigoshop recently released v1.0 of their WordPress e-commerce plugin. Beware the upgrade from the existing version is far from smooth. This was found out the hard way when a client updated their site. Tax calculations, featured products shortcode and products out of stock are just some of the errors encountered.
There are fixes in the support forum, but I would suggest waiting for v1.01 at a minimum.
So WooThemes have released v1 of WooCommerce an ecommerce plugin for WordPress. This is a fork of the Jigowatt ecommerce plugin Jigoshop. Given the GPL licensing of the code the fork was legally fine, but I found the whole process ethically dubious. The reason for the fork seemed to be purely for financial gain given their own attempts to create an ecommerce plugin had failed and they could not come to a commercial agreement with Jigowatt or at least 1 other similar plugin development group.
I have 1 site about to go live using Jigoshop, but another in early stages of development. It would be derelict of me not to at least check out WooCommerce for the sake of my client.