During building of the eiffelroom site with Drupal I learned quite a lot about this CMS. First, it has a good API and a whole bunch of modules which help you build your site. Second, it does not provide everything I need.
Thanks to the first point, the second is not really a problem since I can build everything I need on top of the powerful framework. So, while I set up eiffelroom a bunch of modules emerged which I released back to the community.
Last week I presented some of the work I did at the OSCMS summit 2007 (Slides, 450KB PDF). Even though Yahoo's wireless and their beamer didn't like my laptop, there were enough people with laptops (mostly Macs) around so I could borrow one (not a Mac, but a PC). And even though the demo site didn't work correctly first - the configuration on my laptop differs from the hosting I used as a backup - everything went well.
It was an interesting experience to see the people only known through email and IRC. Also the hackfest - a gathering after OSCMS for a day of hacking - was a good place to talk to people and get some patches done.
The next Drupal conference is already planned for September 2007 in Barcelona, luckily right when I'm back in Switzerland.