Roy Thomas Fielding's PhD dissertation "Architectural Styles and the Design of Network-based Software Architectures".

Articles and links on REST and related technologies.

A model for building an application network interface that follows the constraints of both REST and capability-based security. Specifications, tutorials, white papers and programmer documentation for Waterken Web calculus and abstract messaging protocol.

Site dedicated to all things related to the REST architectural style; includes a list of REST resources.

A weblog application that tries to follow the REST architectural style.

Document by Dave Kuhlman provides an introduction to REST plus suggestions and instructions on how to deliver RESTful applications on top of AOLserver, PyWX, and Quixote, possibly with help of a relational database such as PostgreSQL.

Tool for exposing relational databases as REST style Web Service

Architecture of web services and the semantic web. REST/Relational perspective.