[X4]

I have studied XMPP and the whole protocol stack, compared to everything else I could find out there (in a paper I'm working on). However, the conclusion is that XMPP is not worth the an investment although it looks really fascinating at first and second thought. It's pretty much doable with simpler web technology, webstandards also help to keep out the madness that XMPP calls standards..

The biggest selling points of XMPP are that everbody already has XMPP. The counter argument that weakens this position is that everybody already has email, an IP and a phone number too.