This is becoming a bit of a habit, another of my solutions is now a WordPress Plugin, Send to a Friend for WP e-Commerce!

This release removes the need for hacks within core WP e-Commerce files making it upgrade safe as well as includes an options page to manage e-mail and theme options.

CSS styling and the e-mail form template can be altered to suit your site. Check out some screenshots below then jump over to the detailed product page for Send to a Friend for WP e-Commerce.