I have found that I need a snack in the afternoon to tide me over until dinner. Some things I keep on hand:
Almonds
Carrots
Celery
Bell Peppers
Hummus
Low fat cheese
90 calorie granola bar
clementine
small apple
small banana
Lightly salted shelled pumpkin seeds (pepitos)
Raisins
Yogurt
Olives
Natural Peanut Butter
Strawberries
Blueberries
Cereal/1% Milk (I also love almond milk, only 60 calories per cup, it does not have as much protein, though)

Also, I tried the Wasa Crisp 'N Light crackers for the first time this week and love them. They're only 60 calories for three LARGE crackers. Have these with some light tuna salad, hummus, low fat cheese, a little peanut butter, etc.

Here are some snacks that I eat:
Almonds
Loose granola (Bear Naked Brand, etc.)
Mozzerella string cheese
Nonfat yogurt
Shelled pumpkin seeds
Natural applesauce (Motts makes these nice little individual cups)
Granola bars (Nature Valley Oats and Honey and Kaishi TLC Trail mix, I love both)
Apples
Bananas
Oranges (I love clementines)
Cherry tomatoes
Carrots
Melon
Strawberries
Grapes

...and most of all, WATER. I have a 32oz water bottle that I always keep with me. I drink 3-4 fills daily. Drinking lots of water helps keep you from getting hungry.

I have some of the 100 Calorie snacks like crasins, cookies, Fig Nueton Minis, Clemintines, Apples, Stirng cheese. I try have the snacks prepackaged so I don't have to worry about over eating the serving size. Also I have diabetes, so when my blood sugar starts to drop it is easier to grab things all ready packaged.

100cal snacks
 

glass of vegetable and fruit juice-200ml-98cals
vitasoy lite 250mls and small banana smoothie 110cals
small tin of tuna canned in spring water mixed with lettect leaves 105cals
cup of tea with 1 piece of wholegrain toast with tomoato or marmite on top-92cals
big bowl of chopped watermelon and yogurt-? low cal
hope that helps-thats all i snack on

A small bowl of fat free Yoplait vanilla yogurt mixed w/ plain bite size shredded wheat.

Whole wheat thin bun with either a little peanut butter on it or I'll use avocado with hot sauce.

Fat Free Vanilla yogurt smoothies with varying ingredients-frozen blue berries,
bananas, sometimes I'll add a little peanut butter. Or I'll add some low fat chocolate soy milk instead of 1% milk. Very filling, usually gets me through the later half of the day. I bought one of those mini blenders for smoothies- makes it way easy.

I'm always munching on fruit- depending what's in season.

I try to stay away from trail mix- I usually woof the whole bag if I'm not careful and blow up my calorie intake.

For me, snacks are very important. Some of the things I eat alot of are:

cucumbers (very filling and low cal)
cottage cheese (high protein and fat free)
100 calorie bagels (very filling)
sugar free chocolate pudding (still very rich)
Sugar free jello (basically a free food)
carrot sticks with fat free ranch
grapes
Bananas (easy to carry in purse)
natural apple sauce
Kashi Sunshine cereal (very yummy finger food)
Special K protein plus cereal with 1/2 cup skim milk (feels like a meal)
Wheat thins
Greek yogurt (very high protein)


These are just some examples. Various snacks is the key to me staying on a diet. It is easy for me to do healthy meals, but when hunger strikes if you are not prepared with a good snack you can really go down the wrong road.

when I get a craving for something like icecream or chocolate, then I do this:
Take one banana, peel it, cut it in 2 halves, and put each half on a stick, and put them in the freezer for 30-45min.
Melt 40 grams of semi-sweet dark chocolate (on vapor), and dip the bananas in this melted chocolate, so that it covers them completely, and quickly roll it in coarsely chopped roasted peanuts, and back in the fridge..
its sooo yummmyyyy and one popsicle is like 240 cal,but healthy calories "what matters for me"
great snack for me!!

One thing I try to keep is Nabisco Ginger snap cookies, Big flavor so I can be satisfied with one or two- Also, graham cracker are a good snack.

I make homemade pita chips for the crunchy snack cravings:

Take a package of whole wheat pita bread (can use other kinds if you want), cut each loaf into six triangles and separate the two layers. Put on a cookie sheet, mist lightly with olive oil, and sprinkle with seasonings (I use kosher salt, pepper, oregano, garlic powder, onion powder, and/or paprika) in any combination. Bake at 350 till brown.

They're a lot lower in fat and a lot cheaper than the ones you buy in the store, and great with hummus, any dip, or just plain.

I usually have almonds, yogurt, carrots, raisins and oranges around to stave off my cravings. Having things that you can eat raw around is better than having to cook or prepare something all the time. :D