Readers' Poll: Which is Your Preferred eCommerce Solution?

If you've ever been involved in an eCommerce project, the odds are that you've used one (or more) of the many off-the-shelf solutions available these days. Which ones have you worked with? Which ones do you recommend? And which ones, as a designer, would you like to learn more about?

Handy eCommerce Links..

Fancy reading more about the products mentioned? Check them out at their respective homes..

Magento
Shopify
OpenCart
osCommerce
X-Cart
PrestaShop
Spree
WordPress plugin (WP e-Commerce for example)
VirtueMart (for Joomla!)
Ubercart
Zen Cart
Cubecart
3dCart
LemonStand