I particularly liked the following note:
The usual standard disclaimer applies: REST, the Web, and HTTP are not the same thing; REST could be implemented with many different technologies, and HTTP is just one concrete architecture that happens to follow the REST architectural style. So I should actually be careful to distinguish “REST” from “RESTful HTTP”.
Remember my “WS-Web (The Web using SOAP)” post from few years ago? :-)
REST (an architectural style) != Web (an application) != HTTP (a technology).
* Update: I now know why I missed it. Outlook has not been updating my feeds for more than two weeks now (my fault!)