Relax! You're not going to gain it all back! You'd have to make a lot of really bad choices to gain it all back and it doesn't look like you're doing that at all. But you're very smart to nip any regain in the bud at four pounds and not let it get out of hand. Have you checked out the sticky in the Maintenance Library -
TFL Key #5: Nip It In The Bud: Break The Relapse Cycle? It's got a lot of great info in it.
Let me ask you a few questions before we look at your menu -- first, do you count calories or track in Fitday? It's really hard to figure out exactly how much you're eating unless you can add it up. Did you count calories while you were losing?
Second, do you get hungry during the day eating what you have listed?
Third, have you changed your eating since you reached goal?
OK, my first take is that you are REALLY light on protein (that's why I asked about whether or not you get hungry). Your breakfast and three snacks are almost all carbs (there's a little protein in there, but not much). I would be chewing my arm off from hunger an hour after eating each of those meals!
If the oatmeal is the instant kind, it's highly processed and full of sugar. Better to substitute the real stuff and it cooks in only 2 minutes, 15 seconds in the microwave. Scramble some egg whites while it's cooking it and you have a real breakfast.
Yogurt: definitely opt for the SF, LF kind. You could add a protein serving to that also.
Lean Cuisine: highly processed, low in fiber, high in sodium, low in protein - but convenient
. Could you pack a lunch instead with protein, some veggies, and complex carbs?
Apple and rice cakes: all carbs, though the apple is a good carb. The caramel rice cakes are loaded with sugar and have very little nutrition. They're basically diet junk food. How about string cheese with the apple instead? Or some other protein?
Salad: I can't knock a good salad
, though you could throw some chicken or tuna on for protein.
Dinner: you're probably getting some protein there. Other than that, we don't have much to go on.
I'm all in favor of eating every three hours or so and frequent small meals, so I definitely think you're on the right track there.
What works for me are five meals a day too, but I make sure to have some protein with each one. I put together a protein + good carb, which would be fruits, veggies, and complex starches like (real) oatmeal.
So why am I making such a fuss about protein? A few reasons - first, protein helps keep you full longer. Second, when you're working out, you need protein to build and repair your muscles. Third, there are some studies showing that eating a higher protein diet helps with weight loss:
http://msnbc.msn.com/id/3076969/ .
So please don't be scared! As long as you're consciously thinking about making good food choices, you'll be just fine. My suggestions are to track what you're eating to see what your daily calories are, add in some protein, get away from sugar, and beware eating out!
My maintanence! A little help, pretty please?
And doesn't it just make you feel soooo good? 
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