What's Your Favorite FOSS Shopping Cart?

[Kimball Larsen]

In the past I've used OSCommerce[1] and ZenCart[2].  I've just  
discovered and am investigating Magento[3].

What others are out there?  Anyone have any feelings approaching  
zealotry for one?

Thanks!

- Kimball
http://www.kimballlarsen.com

[1]: http://www.oscommerce.com/
[2]: http://www.zen-cart.com/
[3]: http://www.magentocommerce.com/

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