The Drupal Association just approved the proposal from the Danish team to organize Drupalcon 2010 in Copenhagen. The conference will take place in August, the exact date will be finalized in the coming week.
If you wonder what kind of greatness is waiting for you, check out their proposal at http://drupalcon.dk/cph/node/35 or http://drupalcon.dk/cph/node/35?print&book_recurse
Congratulations to the Danish team!
EDIT: The dates are 23 - 26 August, with events on the day before and day after likely.