Freezable stuff:
lasagne
meatballs & tomato sauce
chicken tetrazzini
store bought raviolis or tortellinis
ground beef for bolognese sauce, tacos, etc.
grilled chicken
cubes of pesto sauce, or other fresh herbs, herbed butter (You can can add these to pasta, or chicken or veggies to make it feel like you cooked a real meal!)
Also, after our 2nd was born, we started doing a lot more "batched" cooking. On Sunday, we'd grill or saute a lot of meat & veggies for the whole week which we could then add to salads, pastas, sandwiches during the week. We do a family pack of chicken or steaks or ground beef or sausage (whatever's on sale), along with some roasted peppers, zuccinis, mushrooms, eggplant, or whatever. If we don't grill the veggies, we'll at least do the slicing & chopping. Sometimes, we'll even pre-cook a big batch of B. rice or penne pasta. All of this is stored in the fridge for the week. Then we assemble our ingredients each night, & vary the condiments & starch to make completely different meals - pasta, pesto & parm for italian night, Rice or pita with yogurt, oregano, lemon & feta makes the same ingredients greek, Rice, Ginger, peanut sauce makes the same stuff asian, tortillas & salsa makes it Mexican... you get the idea. In a pinch, you can also add packaged chicken or beef stock to a lot of the same ingredients & make a great soup. Or add some packaged salad greens and you have an easy high-protein salad. It means we only do the big cooking one night per week, assembly & reheating in a skillet takes no more than 15 mins, and we don't feel like we're eating the same thing every day.