"Writing an Orchard Webshop Module from scratch" module development tutorial
"Writing an Orchard Webshop Module from scratch" is an excellent, 11-part (planned for 15) tutorial on Orchard module development by Sipke Schoorstra. Everyone who has ever written at least a short tutorial will feel what amount of work such a series contains: not surprisingly it's well worth reading, even for ones already somewhat familiar with Orchard module development.