Environmental: mold, mildew, goldenrod, ragweed, lilacs, wisteria, roses, amber, grass, most pollen, unrefined cotton, anything that grows, pretty much. dogs, rabbits, hedgehog saliva (don't ask). tobacco smoke (now that i've quit).
Random: nickel, yellow #5 (one in every 500,000 people).
That's all I can remember for right now. This sucks. Allergies suck ass. At least I'm no longer allergic to cats.