I see the environment as the biggest single issue in the election. Dion will try to make it that way, the Tories will dump on it, of course. Afghanistan is a non-starter since there is no real difference between the Tories and Grits.
And of course Tory "integrity, transparency and accountability" but I'm not sure how big these issues are with the public.
Most of all, another minority government and no election this fall.