Hmm... I don't know if the foods contribute to my weight loss, but things that have kept me satisfied, full or better versions of what I used to eat include:

Oatmeal - as Angie stated, filling and heart friendly
Eggs - A couple times a week, I'd include these in breakfast, usually boiled, sometimes scrambled or an omelet
Popcorn - as a snack to satisfy a craving
Tea/Coffee - they satisfy my taste cravings (for starbucks type beverages) but without the added calories, fat, etc
Spinach- I just liked to add this to all sorts of things - omelets, sandwiches, salads, etc
Spaghetti Squash - this and other squashes are a great filler that can be used in a variety of recipes, including spaghetti!
Francesco Rinaldi To Be Healthy pasta sauces - I've tried to find better versions of foods I used to eat, and I LOVE spaghetti
Sara Lee 45 cal bread - another 'better' version in which I can still have toast or a sandwich!

I'm sure I have more; I've really learned to enjoy and appreciate food

I have 2 things that I'm sure contribute:
1.) My bacon and egg breakfast. On the mornings that I can find time to fry a couple peices of bacon and a couple of overeasy eggs, I always feel fuller longer and I almost always see a drop in my weight the next day. (I'm one of "THOSE" people that does the terrible weighing yourself daily thing;)
2.) COFFEE!! I'm sure I must be addicted, but it boosts my energy when I'm not wanting to work out, and it's also a great snack for me when I'm feeling a little hungry in-between meals. Drink a cup of coffee, with a little of your favorite sweetener and it will fill your tummy and help stop any sweet cravings you might be having:)

Green tea - it boost your metabolism
Greek yogurt - it has tons of protein and keeps me fuller than other yogurts.

I think that's about it. SamandJacksMom, you can make it at home. My friend did a blog post about it once... I'll see if I can find it and send it to you. He was working from home for a while and just kept making yogurt all the time.