A simple e-commerce / shopping cart plugin by Adelie Design that focuses on setting up a simple, low-hassle e-commerce site. The plugin aims to just work without requiring complex configuration on the part site administrator or end user. Modular components can extend the functionality of the plugin and add new payment gateways.
Currently supports PayPal WPS and the Authorize.net and Sage payment gateways. Others (including PayPal WPP, and Payflow Pro) will be added in the future.
Plugin homepage with set up info: http://www.adeliedesign.com/rsecommerce/