It’s still in its infancy, but if you’re a fan of mileage runs this site is for you: Mileage Brain. It’s often difficult to find mileage runs out of Canadian airports, so I think this will be pretty useful.
Even if you’re not a hardcore mileage runner, it’s a good tool to find quick vacations and weekend trips.
Right now, it looks like the best mileage deals from Toronto are YYZ-LIH (Kauai, Hawaii) for one night at the end of Feburary, or YYZ-BKK (Bangkok) for a couple days. They’re not particularly good deals strictly as mileage runs, but sound like a fun way to spend a weekend!