This past year, I've been happily presenting at FOSDEM (which "is probably the most developer-oriented Free and Opensource conference" and is taking place in Brussels, Belgium each year). I've had a great session on new things in Drupal 6 and it was even videotaped.
FOSDEM is again coming to Brussels in 2009, and the dates are Saturday 7 and Sunday 8 February 2009. The 2008 Drupal group is now renamed for 2009, so FOSDEM-interested parties can congregate in there for this next year as well. The event itself ran on a Drupal website, and keeps running for the upcoming year as well. It would be great to set up a Drupal developer room again there in 2009!