I'm in love with Queen East, so please do take my bias into account :P
I'm a big big fan of Red Rocket!!
Red Rocket's got it's own style, fresh baked goods, daily made sandwiches, a great open concept, free wifi, and bar-style window seating with electric outlets available all over the place! It's evident that they are designed with the consumer in mind. :)
In the summer, the Red Rocket's patio is my favourite work-from-"home" spot in the city. Check'em out :)