Stir-fries are great. I also recommend brining roast poultry, and I like to stuff them with oranges and rosemary.
A coupla other tips:
I save all of my vegetable waste (broccoli stalks, onion skins, carrot tops, wilty celery, etc etc) and make them into vegetable stock, and use it for all of my cooking (you have to add a potato or two and some garlic cloves, and salt, but it's pretty awesome).
This isn't such a huge bargain, but I made homemade cherry limeade tonight and it's really really good - I muddled 7 cherries, made a cup of simple syrup (1/2 sugar, 1/2 water, boiled), and juiced a dozen limes, filled the rest of the pitcher with water. I also sometimes home-brew iced tea this way, using mangos, raspberries, plums, peaches, kiwi, or strawberries for flavoring.
Homemade salad dressing: I like to infuse olive oil with garlic and rosemary, and balsamic vinegar with fruit - I've tried peaches, plums, oranges, various berries. It's also pretty easy to make salad dressing out of lemon juice, olive oil, salt, & pepper.