RESTwiki:Site dedicated to all things related to the REST architectural style; includes a list of REST resources.
MT::REST: Project implementing REST-style access into Movable Type.
Paul's REST Resources: Articles and links on REST and related technologies.
REST - Representational State Transfer: Roy Thomas Fielding's PhD dissertation "Architectural Styles and the Design of Network-based Software Architectures".
REST for AOLserver, PyWX, and Quixote: 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.
RESTLog: A weblog application that tries to follow the REST architectural style.
sqlREST: Tool for exposing relational databases as REST style Web Service
Waterken Web Services: 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.