Self-Contained System, a useful variant of microservice http://scs-architecture.org/
ROCA, the essence of web application principles, for using the web like it was designed for.
Excellent article on heise about ROCA
You should understand this before you call your API RESTful: http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hypertext-driven
highly recommended, author of a very good book for Web Api design: http://amundsen.com/hypermedia/
Interesting article about using HTML as the media type for APIs.
Worthwhile video presentation from the same author of the article above: http://www.infoq.com/presentations/web-api-html .
- some popular Web APIs:
Access and Identity Management
excellent eBook on Identity and Access Management
useful 50 Data Principles For Loosely-Coupled Identity Management from the same author then above
Online Webinar about The Future Of Federated Identity: Or, Whither SAML? (recorded July 19, 2012) at http://www.incommon.org/iamonline/
Comprehensible comparison of OAuth 2.0 and Web Browser SSO Profile: Choosing an SSO Strategy: SAML vs OAuth2
Forrester research article about Web Apis, OAuth and the enterprise.
should not be missing, the dissertation from Roy Fielding.
List of intresting Web Tools.