[mcain]

My favorite is chicken salad. Chicken comes in cans like tuna, but is a welcome change from tuna. Drives my wife nuts, since I like chicken salad too often.
The other standby is cheddar cheese, peperoni and green olives, with crackers (if its on your diet)--makes an interesting combination.
Both of these are easy to prepare, easy to eat, are a change from tuna, and reasonably interesting to eat.