From Web Design:
No databases, MySQL or PHP required, so it runs on just about any website. Compared to other shopping carts, very simple to use. Generated well laid out shopping pages with thumbnails and descriptions. I was able to add a template for the shopping cart to make it match the the look of each of my sites. Contains it own FTP application for uploading files. Good user support. Emails answered promptly.
Requires a PayPal account.
Currently running the shopping cart on three of my sites and this is definitively the easiest of the carts to setup I have tried so far.