E-Commerce Plugins and Shopping Carts for WordPress

Want to start the new year off by turning your WordPress website into a full-fledged online store?

You’re in luck – WordPress has a wide range of options available. We’ve put together a list of e-commerce plugins and carts that work with WordPress 3.0+, as well as a short introduction to each to help you narrow down your options. These are in no particular order. Some are free and some are premium, but what they all have in common is that they’ve been fairly recently updated for the latest version of WordPress.

Read at: 

WPMU.org

Facebook Is About To Rake In Huge Ecommerce Dollars

PayPal Integration Center

The PayPal Integration Center contains all the resources and support you need to build PayPal payments into an e-commerce website or application.

https://www.paypal.com/IntegrationCenter/ic_home.html

open source

Big Cartel helps you create a shop to sell your goods online with as little fuss as possible:
http://bigcartel.com/


Professional publishing platform:
http://www.movabletype.org/