Just got back yesterday from Portland after the XMPP interop event ... it was a really cool event.
We had 6 completely different servers interoperating without too much of a problem - including when some funky multi-byte testcases were tried in S2S which stpeter dreamed up There were some hiccups when TLS was enabled with SASL External / dialback ... but nothing too serious which could not be fixed.
The achievments of the event are pretty incredible - there is no other protocol on instant messaging which can possibly boast of achieving something like this - most dont even have an implementation of size more than 1 !

While the testing was going on , in parallel we had some very productive discussions , including to clarify on aspects of the RFC's and JEP's : what was debated upon would get translated into changes or discussions at standards-jig pretty soon !
Portland looked "pretty" - from what little I saw , and the event venue itself allowed for a real nice view of the downtown.
I could not attend OSCON unfortunately ...