Building a Shopify App on Sinatra
With The Shopify API it is pretty easy to hook up a custom application residing on Heroku servers to a Shopify store. The authorization is nicely handled and once a store accepts the application, many new possibilities for new functionality are present.
Sinatra is ideal since it supports the concept of mapping URL's directly to methods. Tricked out to render Haml and Sass, templates are simple and marked up with CSS generated by Compass. This combination is fantastic. Just scratching the surface of these packages, and already have been convinced it is the way to go.