This theme has been around for some time, and is available here: http://wordpress.org/extend/themes/smells-like-facebook
I’m using wp-ecommerce by instinct, a New Zealand company.
They have a free version available for download from WordPress, as well as a paid upgrade from their website.
I’m using wp for an ecommerce site simply because I am familiar with wordpress, and didn’t want to learn a new platform from scratch such as oscommerce.
