This presentation talks about the important — and largely overlooked — hypermedia constraint in REST.
I think this is a must-see for any team serious about implementing a RESTful API, which I’m starting to think of as hypermedia APIs.
IMHO almost all the confusion and trickiness about REST disappears if you start from the point-of-view of how to deliver and use hypermedia. More and more I ask the question, “What would HTML do?” when posed with a tricky design question. This presentation does a great job of explaining that.