Well I've created what I believe to be, and what this article describes twice now for internal web-services[1]. Its really quite easy if you are disciplined and it really ends up being a very nice interface. The trick becomes if you want to eat your own dogfood with a website. Since forms can only post and get it makes it tricky without JS.

Otherwise I've been very happy and content with my 100%[1] restful webservices.

[1] According to this article, the one it linked to, and a medium skimming of the original dissertation.