Caucho has written an intense 3 part (so far) article series on its new "ProjectX" technology. The company sees this project as a new and better way to quickly build fast, scalable services that are exposed through not only REST but also through Websocket services. They also seem to be coining a new term "Object Oriented Services" in this series. And just to be clear, when I say 'intense' I mean that this review goes as far down as the hardware level.
You really ought to take a look and tell us what you think!