Bunch of links to articles that I collected on REST.
http://tomayko.com/writings/rest-to-my-wife : A very good introduction. Some people find the title sexist though. Meh.
http://stackoverflow.com/questions/671118/what-exactly-is-restful-programming : Wanna learn something? Start with StackOverflow.Read at least the first two answers.
http://martinfowler.com/articles/richardsonMaturityModel.html : A very nice introduction to REST architecture. Must read.
https://www.ibm.com/developerworks/webservices/library/ws-restful : A basic introduction
http://rest.elkstein.org: A basic tutorial
http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm :The article that started REST by the guy who invented REST and HTTP.
http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hypertext-driven : The guy who invented REST and HTTP has more to say.