RE: any winter stuff that helps windsurfing
I've never sailed on snow, but some of your fellow Canadians seem to be pretty serious about snow and ice windsurfing. Check out the commerically available "snowfer"
It appears to be a versatile snow and ice board that uses a normal windsurfing sail. The videos are cool!
Or build your own sled with some old skis, plywood, and a u-joint. There was an article about this in the recent Windsurfing Magazine (US).