lots of great suggestions already!
if you belong to costco (or know someone that has a membership), you may want to check out some of their snack food...they've got plenty of organic or healthy "junk" options (veggie chips, pita chips, organic and all fruit "fruit rollups", etc). we, too, try to limit the amount of junk food that comes in the house, but costco makes it too easy to justify it!!
costco also has some reasonably healthy (all natural and preservative free or organic) prepared meal options, too. we get frozen spinach ravioli, thin crust pizza, apple and gouda chicken sausages (low fat and calories with no nitrates or nitrites to replace hot dogs) and veggie burgers.
one of our favorite snacks these days is "green bean french fries": we take fresh green beans and mix them with parmesan cheese and a bit of salt and pepper. we spray a pan with Pam, put the beans on it, then put a light spray of Pam over the beans. in the oven for about 20-25 mins at 425. my 3 4 y.o.s will eat an entire plate of them in minutes.
another snack that we make once every few weeks is peanut butter play dough...i think the recipe is 1 c. peanut butter, 1/2 c. (or is it 3/4 c?) dry milk, and 1/4 c. honey. i don't know the recipe because my kids and i just mix it all together until it feels right. they made it today, played with it for about 1/2 hr (with some snacking), then i gave them apple slices to put their playdough decorations on and eat. it is A LOT of peanut butter in the mix, but we divide the mix into 3 and then i monitor how much they eat, and it turns out to be no more than a few tablespoons, usually (about a serving size).
other fun healthy snacks here are soybeans still in the pod (great fun to pop out) and fruit juice freezer pops.
i have also found that my 3 will be more interested in the "usual"fresh veggies if cut differently once in a while. i have a julienne slicer, one of those vidalia onion choppers (LOVE this for fruit salad!), and i just tonight bought a mandolin slicer.
fruit smoothies are popular at our house this week, too...whatever fresh and/or frozen fruits we have around plus a big drizzle of honey and some ice cubes in the blender.
we also do a lot of veggie bread here (carrot, zucchini, pumpkin). i make 2-3 batches at a time and freeze loads of it. to make it (and pretty much most other baked goods), we use 1/2 white and 1/2 wheat flour (and i throw wheat germ and flax seeds into the food proccessor with some of the wheat flour and measure that in with the wheat flour, too). i also substitute egg whites for eggs, applesauce or plain yogurt (or a mix of both) for oil or butter, and i use less sugar than called for....this changes the texture and taste of the breads/cookies/pancakes, but we've gotten used to it and it makes for guilt free snacking for us.
as for meals, we do as P.P.s and grill 2 nights' worth of chicken at a time- the first night for a grilled chicken meal, the 2nd night i slice up the chicken and mix with peppers and onions for fajitas.
looking forward to other ideas!
happy summer!
I rollup with chicken or turkey breast and cheese to place in the hot dog roll or fill with tuna or chicken salads, they are a great size for kids. They also hold up very well in a lunchbox. 
