WP e-Commerce is one of the most popular shopping cart plugins for WordPress. It's developed by the team at Instinct.co.nz and has been download nearly one million times. Click here to find our more about WP E-Commerce.
These three video tutorials will take you through setting up WP E-Commerce, getting it correctly configured and adding your first products.
Introduction to WP E-Commerce
Configuring Your WP E-Commerce Store
Adding Products to Your WP E-Commerce Store