I've written about my reliance on frozen peas on more than one occasion. Another staple of my freezer: unsalted butter. I can't emphasize this tip enough: When butter goes on sale at your local supermarket, stock up and stack the boxes in your freezer. They'll keep for a good year at least (I wouldn't really know; mine never last that long). You can quickly and easily defrost individual sticks of butter in the microwave. (I don't have one, but I'm told this.)
This is an especially good thing to do in the month or two before the holiday season, or if you have a birthday cake to make -- you'd be surprised how many sticks of butter you can go through making Christmas cookies or frosting.