AMD (Asynchronous Module Definition) is JavaScript's missing module system for the browser. It's a cosmos of interoperability, efficient loading, dependency resolution, code optimization, etc.
At excentos we're using it as part of the Dojo Toolkit to organize our single-page product advisor web apps.
I will give a short introduction to the concept and some tools and I'm going to explain why everyone with a reasonably-sized code base should adopt it.