Over at the Shopify Technology Blog, I’ve got a long — but easy-to-read-and-follow article covering the setup for writing Shopify apps. If you’re looking to make some money and want a dedicated group of customers, the 16,000 or so Shopify shopowners are a great market to target and the Shopify ecommerce platform is a great one to build on. Check it out: Developing Shopify Apps, Part 1: The Setup.