Feature List (not all features might be listed!):

Products/Categories:

•  Add as many Products and Categories as you want
• Can also be used just as a catalogue (without cart features)
• Unlimited Category/Subcategory depth, products can be assigned to multiple categories
• Sort your Categories the way you like
• Sell downloadable Products like MP3s, Templates, Videos or Software
• Add a Thumbnail and a full size Image to every Product via your Browser
• Add Attributes like Size or Color to your Products to offer product variations
• Use Product Discounts (percantage/total, time limited or not) 
• Show Details & images for every Item 
• Manage the Stock Level for Products and Items
• Automatically Notify Shoppers when a Product is back in Stock
• Feature specific products by setting them "on special"

Easy Configuration/Customization

• Manage your shop through an easy to use web based interface
• Global Price/Currency Display Formatting 
• Templates for Product Display Pages 
• Extend the Shop with other Modules and Functions
• Manage different Currencies, Countries

Shipping Addresses / Rates

• Shoppers can add individual Shipping Addresses
• Fetch Shipping rates live from Intershipper, USPS, UPS, Canada Post, etc...
• Write your own Shipping Modules using the Shipping API

Tax Rates

• Product prices can be displayed "including tax" or not (set for each shopper group)
• Choose between Shipping-Address-based tax calculation (city/state & country/region)
        OR
• Store-Owner-based tax calculation (e.g. in european countries)
• Add your own shipping carriers and shipping rates

Payment

• Use safe SSL encryption (128-bit) and Shared SSL
• Capable of live credit card processing
• Supported Payment Providers:
• authorize.net online Credit Card Processing (AIM)
            o 2Checkout
            o PayPal (with IPN gateway)
            o Paymate
            o NoChex
            o WorldPay "IPN"
            o PayMeNow
            o eCheck.net
            o eWay (XML transactions)
            o eProcessingNetwork
            o Chronopay (Homepage)
            o and more...
• Payment Module API for custom payment modules...

Order Management

• Complete Order Management
• Automatically notify your customers when the Order Status changes
• See who has ordered: IP address storing
• Extend the pre-defined order statuses with your own ones

"Nice" Features for Customers...

• Let your customers easily search for products through a search form
• Shoppers can see, in what time a product will usually ship, on product-details page (with nice images!)
• Shoppers can manage their user accounts
• Shopper can view all their orders (and order details)
• Order Confirmation mail (customizable!) is sent to shopper and store owner

Additional "Amazon type" Features for client interactivity

• Cross selling _ Mix and Match offers and products.
• "Welcome back (John b. Customer)
• Affiliate Program add-on option
• Write a Review on this Product
• Tell A Friend and Newsletter sign up