CLC should be able to give you some ideas, probably along the lines of what they offer for their Mill Creek - lug sail and a leeboard.

You may find some ideas at the American Canoe Association's Sailing Committee at http://www.enter.net/~skimmer/index.html, or at the Cheap Pages at http://www.friend.ly.net/user-homepages/d/dadadata/canoes.html.

As Roy Rogers might have said, "Happy sails to you."