XMPP

• http://www.25hoursaday.com/weblog/2008/07/27/WhenRESTDoesntScaleXMPPToTheRescue.aspx

Hmm - it is really about PubSub - and it looks that it's time is comming. PubSub is the only way to scale complex synchronous communications so as we see more and more real time services (like twitter) we'll see more of PubSub. – ZbigniewLukasiak

: Agreed PubSub is the only thing that scales. – PhilJones