I too make big pots of soup then freeze them in individual servings and take them to work...even in summer (the office where I work is usually Arctic in temperature so it doesn't seem too bad). If you don't have a microwave invest in a small thermos which will keep your soup toasty warm until lunch time
How about a healthy dip with a selection of vegetables for dipping (and maybe some home made pita crisps or some crisp breads).
I like savoury muffins (I put recipes for two different kinds in the Healthy Recipes section yesterday). Again you can make in advance and freeze then take them as you need them.
If you have the Annette Sym books there are lots of recipes suitable for freezing. Again you can make in advance and freeze in individual servings (can even include the cooked pasta or rice...it's like your own frozen dinner but much healthier and tastier than the average McCain dinner).
Can you tell I like to freeze things?