Resource-Method-Representation

Why

If we think about URLs as being only nouns, no verbs, then we end up with a URL for every important thing in our site. Those URLs can then be bookmarked and linked easily. We can change code behind the scenes without changing the URLs as the URLs refer to objects that don't change rather than functions that do.

The model is inherently object-oriented, with every object (at least those of meaning to the outside world) having a URI and every object responding to the standard HTTP verbs, GET, PUT, POST, DELETE. This is object-orientation at the level of the web, not at the level of a server-side language. That's a very different thing to what JSP does, where internally the server-side code may be object-oriented, but the URIs refer to verbs, so look more procedural or perhaps functional.

The above is from Rob Styles from Talis You need to read the whole article!
http://architects.dzone.com/news/common-rest-design-pattern
Paul Sadauskas on RESTful services (very good)