If you've recently surfed over to yapc.org, you'll notice you're not getting the home page you expect. The domain inadvertently expired and we're currently working on renewing it. It turns out the reminders were going to an inactive email account. We're "not the first":http://www.whoisfinder.com/news/200402/washpost-renewal-failure.html to miss a renewal, but it's an inconvenience nonetheless.
In the meantime, many of the upcoming Perl events are hosted via Act!, and they keep links to active sites "on their web page":http://act.mongueurs.net/conferences.html. Thanks to everyone who reported the outage.