Calweasel sells both a service and a product. The service is private tutoring for the California Bar Exam. The product is a series of study guides for the exam. The site serves as an advertisement for the tutor service.
In addition, there is a storefront where customers can buy books. Credit card processing is handled by Paypal. Order fulfillment is handled with the Ubercart module. Calweasel also collects demographic information with each order.
Blog posts on the site automatically propagate to Facebook and Twitter. In addition, there is a gallery of users who "like" Calweasel on Facebook, and links to share the site with Facebook and Google+.
I also provided consulting to Calweasel to help with online advertising, both via Google Adwords and Facebook.