By and large, XMPP based products interoperate with other the way one would expect. We use a commercial XMPP based system in our environment and end users will happily use IM clients other than the one provided by the system vendor (Apple's iChat, for example). In addition, we are able to federate with other XMPP networks like gmail.com without significant problems. This is analogous to the SMTP model you mention in the article.
In the SIP/SIMPLE world, Microsoft's SIP does not interoperate with IBM's SIP or anyone else's for that matter. While there are SIP/SIMPLE standards, they are numerous and challenging to adhere to. Microsoft, IBM, and all other SIP/SIMPLE players have yet to achieve anything like the interop found today in the XMPP world.
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