I really love Thai Princess, it is hands down the best delivery thai food in the city, and I have tried quite a few places.
Recommend the Green Curry chicken, Spicy Coconut Curry beef, and the classic pad thai. Vegetable spring rolls are delicious too (better than the Princess spring rolls).
Prices are fair, delivery is always on time. Unfortunately I've recently moved out of their delivery zone but I'll still be getting take out when I'm at work just up Spadina.
Only reason they don't get full 5 stars is perhaps could be a bit more veggies in the curry dishes (I like some bok choy or carrots in my curries). Otherwise it's a delicious, filling meal every time.
One last thing, I have eaten in the restaurant as well and it's much nicer than it seems from the outside. Noise level isn't bad and the service was fast and friendly.