I dislike the traditional definition of phobias, personally. Considering they are classified as a subset of panic disorder, yet are defined as an "irrational fear," it doesn't really make sense to me. I love bats, but they make me extremely anxious in anything but a controlled environment. There are dozens of things that cause me an irrational amount of anxiety, but not many I will call a phobia, because I don't actually fear them. However...
Acute Claustrophobia- Small spaces I can't get out of(i.e. locked in a small closet, but fine being in an unlocked one) and crowds. The worst part of this is that I often can't judge the space-crowd ratio well enough to dodge it. Being in either situation over the acceptable level makes me hyperventilate and have a panic attack of the cry-in-a-corner level.
Agoraphopia- Crowds again, but also wide-open spaces. I think it might be a genetic throwback to warrior ancestors, because the form of situation makes sense: Nowhere to hide, nothing to hide behind, nothing to obscure an enemy's vision of me. Even a large empty room, like a big school gym, I cling to the walls. I can't make myself walk through the middle.
Spectrophobia- Awesomely enough, there are two phobias for "fear of mirrors." This one is specifically related to the paranormal side of them. Someone else mentioned this; I once saw a Shade in a mirror. On top of that, I've long been afraid of seeing something appear behind me while looking in a mirror. I also refuse to turn my back on a mirror, as someone mentioned previously. What's there when you aren't looking? Though weirdly enough, I want to try going into a mirror box.
Thalassophobia- Fear of the ocean; more often so fear of what lies beneath it. This one's a new one for me. Recently, I've read a lot of stuff about weird fish and other such things, and I've gotten to the point that I don't ever want to go in the ocean in any spot more than a few miles from shore, or more than a thousand or so feet deep. The thought of the creatures directly below me unnerves me to no end. And while I love scuba diving, I'll stick to lakes; way too many fish and bigger things that I can't keep track of moving closer than I'm comfortable with. Plus, a panic attack while swimming is just NO.