For snacks I have tried light jell-o, which isn't too bad. Every once in a while I take a low-carb bar (usually atkins, they are cheaper at walmart) to school with me. It takes the edge off.. the almond brownie one is horrid but I liked cookies and cream.
I generally eat two salads a day and a bowl of low carb special K for breakfast. It really isn't that many carbs and I find that I need them because I run and otherwise my muscles hurt.
My best advice though is to drink a lot of water - it helps during class. I actually bought a Nalgene bottle after becoming tired of carting around evian bottles and having them leak all over my stuff. The ounces of water are also marked on the bottle - which is great because it helps you keep track of how much you need to drink - only two large nalgene bottles!

And my favorite thing about LC and student life... wing night! dry spiced with hot sauce and sour cream on the side! yum!