Contra Dance Links for the United States, Canada, and the World - A list of national and international contra dance websites.
A contra dance location map -- not completely comprehensive, though a great resource.
The Dance Gypsy - Dance listings for folk, contra and traditional dance
Kiran Wagle's Contradance Page - The single most extensive set of links for contra dance events and information that we're aware of. Assembled and maintained by Kiran Wagle, a rather well-known contra dancer in the Washington D.C. area.