One of things I've always found odd about my own eating habits is that I hate tomatoes by themselves. I love tomato sauce, ketchup, even tomato slices in sandwiches/burgers, but I can't eat, say a piece of tomato in a greek salad.
Other Stuff:
Fish - And I worked at red lobster for 3 years (I like shellfish though)
Eggs - The smell turns my stomach
Olives
Mushrooms
Another odd thing is there are tons of foods I probably wouldn't eat unless I prepared them myself, but then again, I'm the best cook I know