I usually go for Chili. In fact, I just shared this recipe the other day:
http://www.skinnytaste.com/2009/01/c...-3125-pts.html
It makes quite a bit, and if you're feeling a little daring, you can bring some light cheese, chopped green onion and low fat sour cream... yum! You could also bring baked tortilla chips.... or find a light version of corn bread.... oh the possibilities!