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Some of the high-level features of the @package_name@:

Products are divided into categories (like books, journals, ...), subcategories (computer, fiction, ...), and subsubcategories (operating systems, web publishing, ...) which are set by the site adminstrator (if desired). Products can belong to as many categories / subcategories / subsubcategories as needed. Users can search by category / subcategory / subsubcategory and the site administrator can make product recommendations by category / subcategory / subsubcategory.
The site administrator can upload any desired information about products either into the database or into the file system. Standard product information such as product name, regular price, etc., and admin-defined custom fields are collected in the database. Pictures of the product and other formatted info like sample chapters, for instance, are uploaded into the file system.
Users can input comments and ratings of products. The site administrator can choose to:

The site administrator can input professional reviews of the products.
The site administrator can specify whether the product should be displayed when the user does a search. For example, they might not want the product to display if the product is part of a series or if the product is the hardcover version of a book that also exists in paperback.
Links between products: the site administrator can specify that one product always links to other product(s) on the product-display page.
Products can be listed before they are available for sale. The site administrator decides whether customers are allowed to preorder items or if they are not allowed to order until the date that the products become available.
A product can have a lower, introductory price. It can also have a limited-time sale price, and a limited-time special offer price which is given only to those who have the special offer code in their URL.
The site administrator determines the geographical regions in which tax should be charged.
Shipping costs are determined by the site administrator as a base cost + a certain amount per additional item, or the cost can be based on weight. Additional amounts are charged for express shipping, if allowed. Alternatively, the shipping costs can be obtained from an implementation of the Shipping Service Contract.

Users are recognized, if possible, when they enter the site.
Users can be placed into user classes (student, publisher, ...) either by themselves (with site administrator approval) or by the site administrator.
Members of user classes can be given different views of the site, different prices for each product, and different product recommendations.
A user's purchasing history as well as browsing history is stored. Product recommendations can be made based on both histories.
Frequent buyers can be recognized and rewarded.
The site will automatically calculate what other products were most popular among people who bought a given product.

Shopping cart interface: users select items to put into their shopping cart and then go to their cart when they want to "check out". The shopping cart is editable (similar to Amazon.com).
If a user is not ready to order yet, they can store their order and come back to it later (similar to Dell.com).
User receives an acknowledgment web page and email when their order is confirmed.
The user can reuse an address for billing or shipping that they previously entered on the site and, if the site administrator has chosen to store credit card data, they can reuse previous credit cards.
The user's credit card is authorized at the time that they confirm their order. The card is billed automatically only after the site administrator marks that the order has been shipped. With the exception of items that do not require shipping (so called 'soft goods'). Soft goods are billed immediately after the card has been authorized for the soft good total amount.
The site administrator can issue electronic gift certificates to users.
The site administrator is able to give refunds to a user if the user returns all or part of their order.
Customers can view their order history and track their packages.
Customers can purchase gift certificates for other people. A random claim check is generated at the time of purchase and emailed to the recipient. The recipient is then able to use their gift certificate when they make purchases on the site (until the certificate expires).

Users can sign up for mailing lists based on the product categories they are interested in.
Most importantly, since the @package_name@ is tied in with the rest of the Open Architecture Community System, a more complete picture of the customer (Q & A forum postings, Classified Ads, etc.) is known than in a stand-alone ecommerce system.

Receive and respond to customer inquiries via email (includes a spell-checker!).
Record all customer interactions and issues (whether by phone/fax/email/etc.).
Categorize issues.
View complete customer interaction and purchase histories.
Send email using the "canned text" system which allows them to automatically insert commonly-used paragraphs into their emails.
Contact groups of users based on various criteria (date of last visit, number of purchases, pages they've visited, mailing lists they've signed up for, etc.)
Edit email templates that the system uses when sending automatic email to users (e.g. "Dear <insert name>, thank you for your order. We received your order on <insert date>, etc.").
View statistics and reports on issues/interactions (e.g. interactions by customer service rep, issues by issue type).

All of the user display pages are templated. This allows designers to change the look and feel of the site without mucking around in Tcl or SQL code.
The system logs potential problems it encounters (e.g. failed credit card transactions) and allows site administrators to view the problems and mark them "resolved".