Corned Beef House is like a two block walk from the office in Toronto. That and the fact that their sandwiches are so good means that I eat there relatively often when in town.
I've tried the corned beef and the montreal smoked meat, both of which are great. I've also been with friends who have tried the turkey and had good things to say about that as well.
You've essentially got 6 choices for meat fillings for your sandwich, then you choose from 5 bread choices and multiple types of mustard. Sandwiches come in 3 sizes, Huge, Gigantic and Collosal. With 7 oz of meat the huge is usually enough for me, especially given the 9.99 special for a huge sandwich and a beer! :) Yeah, my typical order is the special: huge smoked meat on marbled rye, extra spicy mustard with an amsterdam blonde. maybe a side of potato salad if I'm feeling extra hungry (the potato salad is good)