My favorite frozen staples are the Thai shrimp and veggie dumplings. They're pretty low calorie (under 300 for about 6) and make a good lunch with added veggies. The quinoa with roasted veggies is really flavorful and filling. One bag is good for about two lunches for me (and Connor). Organic waffles are a breakfast staple for C. The frozen fish is amazing, too! We especially love the miso glazed cod.
The refrigerated section has great options as well. I LOVE the eggplant parm stacks. About 300 calories for a portion (two per package). I add roasted broccoli and its a really filling lunch or dinner.
The grilled marinated chicken breasts are perfect for building salads. Last night I took the lemon pepper chicken, added a ton of fresh veggies, and dressed it with tj's peanut salad dressing. Matt was raving that this was "seriously a restaurant quality salad". Now, that's huge. It takes a lot to get that man excited about salad for dinner.