Just last year, I complained that the Shamrock Shake had disappeared from McDonald's. From the comments of that entry, I learned that the Shamrock Shake was still being sold in other parts of North America, but not in Ontario.
The folks at McDonald's Googled 'toronto shamrock shakes' and ended up at that entry. They then sent me vouchers for free Shamrock Shakes, one of which I redeemed last night. It was good!
I'm still not sure why Shamrock Shakes left these parts after 2008 or why they returned, but if you're looking for an ultra sweet, minty treat, you might want to score one before they're gone.
Ya never know when or if they'll be back.