Bagels & cream cheese
Salads. You can even buy plastic Tupperware or Rubbermaid containers that are special made for salads that have a built in holder for dressing that keeps it separate until you're ready to add it.
Anything leftover is portable in Tupperware or a Thermos.. just remember a titanium spork! Nothing is worse than admiring delicious stuffed meatball leftovers in Tupperware, and no fork in sight.
fixed
I'm tired of packing sandwiches. What do you guys bring for lunch!?