I've recently discovered my favorite Thai restaurant in the valley. Don't let the boring name fool you:
480 Granby Road
South Hadley MA 01075
The curries are perfectly balanced and I love their drunken noodles. I feel like people don't really know about this place even though its not very far from Mt. Holyoke College. Service is very friendly and they have a pretty good wine list and great mixed drinks which is usually not a focus at Thai places. Highly recommended!
(Also posted this in another thread....)