The WebHooks feature we introduced in February has turned out to be a big hit with developers, and the latest use of it comes from Sendloop, an email marketing service which gives you tons of control over how you manage your communications.
Sendloop has some great instructions for how to set up Shopify to automatically pass on order information to your Sendloop account. This is exactly the kind of thing that WebHooks are perfect for, and we love to see Sendloop taking advantage of them!