I keep a frozen bag of each in my freezer, blueberries, mangoes, strawberries, raspberries, bananas, cherries, and peaches. I use them for smoothies along with whey protein, skim milk, ice, and sometimes lowfat yogurt.
Another mainstay is frozen entrees. I especially like the smart ones brand, the thai chicken noodles with peanut sauce is the best. While packed with sodium, I read in my diet book that people who eat one meal/day of a pre-packaged meal have a 60% greater success rate. I guess because it is at least one portion controlled meal/day.
Lastly, my favorite and simple snack food, tomato and black bean salad. A mixture of plum tomatoes, black beans, fresh basil, olive oil, salt & pepper, and a little red onion. Makes a very satisfying fiber packed snack. Often I will toast a whole wheat pita and eat it as a sandwich.