I'm allergic to everything.  Seriously.  The skin test has around 80 things on it, and I come up positive for about 75.
Just off the top of my head:  Every kind of pollen, mold, dust, pet dander
In the foods I am allergic to:
Tree nuts (peanuts and almonds)
Shellfish (shrimp and lobster)
Soy
Oral Fruit Allergy Syndrome (potatoes, pitted fruits, citrus fruits, carrots, and many more).  If they are cooked slightly I can eat them though.  This isn't usually classified as a "true" food allergy.  It stems from a birch pollen allergy.
The only common things I'm NOT allergic to are dairy, wheat, bee stings, and penicillin.