XMPP: The Definitive Guide: Building Real-Time Applications with Jabber Technologies by Peter Saint-Andre [Repost]

This practical book provides everything you need to know about the Extensible Messaging and Presence Protocol (XMPP). This open technology for real-time communication is used in many diverse applications such as instant messaging, Voice over IP, real-time collaboration, social networking, microblogging, lightweight middleware, cloud computing, and more.