Pizzaeria Libretto on Ossington gets all the hype these days. Just do a search on here or a google for all the details you'll need.
Mangia & Bevi on King St. East just past Sherbourne is a bit more of a hideaway, with above average thin crust pizzas. Neat European style vibe, most lively at lunch.
221 Ossington Ave, Toronto, ON M6J, CA
Mangia & Bevi
260 King E, Toronto, ON M5A1K3, CA
I tried the pizza at Trio recently (Yonge Street, north of Lawrence Ave.). It was quite good. The crust was thin, but not cracker thin. I chose a multigrain crust and it was very tasty. I also tasted one of my fellow diners' white crust pizza. It was very well executed. Service was friendly and efficient. Of the other two dining companions, one had a pasta and the other chose osso bucco. The osso bucco still needed more time in the pot, so the server recommended the lamb shank instead. According to the diner, it was fabulously tender and tasty. In all, it was an enjoyable evening and very solid Neapolitan-style pizza.