Shopp Chimp is a full featured Shopp 1.3.x integration with MailChimp.
Shopp Exchange Rates allows your customers to see prices in their own currency, instantly.
Advanced Content Templates provides powerful, easy to use content templates that you can use to fill any new post, manually or automatically.
Light, feathery, and trackable pretty links to external URLs or affiliate programs.
Enable e-commerce tracking with Shopp and Google Analytics. The right way. (Requires Google Analytics for WordPress)
The Sent Mail folder you've always wished WordPress had! WP Sent Mail logs every email your website sends to your customers, automatically.