Gnu stated..."it'll (Gulf oil spill) foul the Eastern Seaboard at least as far as Nova Scotia"...

The Gulf stream flows north and east and is very far from Nova Scotia. The currents off Nova Scotia (down to Boston) are influenced by the South and easterly flowing Labrador Current (that's why the waters colder along the coast). There is little possibility that the Canadian Maritimes would be impacted, unless a Gulf stream eddy broke off...which does occasionally happen. The only potential Canadian east coast possibility that I see is the Grand Banks, far off the Newfoundland coast, which do have a influence from the Gulf Stream.