I've spent the good part of last week in Stockholm at a gathering of Nagios users and developers. I was invited to give a talk on syslog-ng and security issues about collecting syslog data centrally as syslog-ng is often used hand-in-hand with Nagios.
This was my first time in Sweden and I can say that Swedish people are the most hospitable nation I met so far, and Stockholm is a very nice city. Also op5, the company organizing the event did their best to make us - the speakers - very welcome.
If you have a chance visit Stockholm I'd recommend to do so.