Incredible but true: In 2009 the WorldCon will be in Montreal!
Following the vote of the fans attending the 65th International Science-Fiction Convention held at Yokohama, Japan, on the first week-end of September, Montreal has been chosen as the host of the convention in 2009 by only 166 votes.
I attended only two WorldCon before: Boston in '89 and Winnipeg in '94 (I missed Toronto in 2003 and Boston in '04 because I was too busy with work -- now that's in Montreal, I will not miss it for sure). In 2008, it will be in Denver (too far for me to attend).
Links: WorldCon, Anticipation / Montreal 2009.