I wouldn't call it a fear per say, but at the moment I can't walk up stairs with no "backboard" (if that makes sense), particularly in the dark. I've seen far too many movies where the killer/zombie etc grabs someone's ankles through the stairs, and I have a vivid imagination. I tend to be alright for the first 2/3rds of the stairs, but then I'm too high up to see through, and I start to get more and more uncomfortable the higher I get. If I'm particularly jumpy that day, it means I end up scampering up the last few like a little girl. I can't stand it, annoys the hell out of me and I realise how stupid I'm being, but I can't stop it. It actually made me roll my ankle a few weeks ago when I took the steps too fast and landed poorly on it at the top.
I have a friend who has developed a fear I find slightly strange - he's a football (soccer for the non-followers) player, and as a result he can't stand watching anyone get damage in their legs, particularly to the achilles' tendon. The Freddy movie where he slices the tendon from under the bed - absolutely couldn't stand it, had to look away. He said all he could think to himself is "Dear God, there goes a career."
My only two strong fears are not having control, and infinity. An example for the control: A few months ago I had a nightmare where I was given the death penalty while innocent, and having absolutely no way to avoid my impending doom. Worst dream I've ever had. It wasn't the idea of death that scared me though, it was the fact that I couldn't do anything to prevent it. Any time I feel that I'm not in control of my own actions and surroundings, I feel anxious.
As for infinity, that developed when as I kid I was thinking about "heaven" in the Christian term, and the fact that it's supposed to be eternal life. I started thinking about how it would go on and on and on for millions of years with absolutely no way to end it (you can't die twice, can you) and the lack of control (there it is again) made me terrified of heaven/infinity, and as a result, death itself. Then again, the idea of nirvana, complete nothingness upon death, doesn't exactly appeal either.
When I was a kid, I had a horrible fear for about a year of germs. I couldn't do ANYTHING without washing my hands. I either didn't eat outside, or would eat by holding onto a bit of paper, napkin etc that I knew was clean and using that to pick things up. I wouldn't touch anything that could give me any germ or disease. In all fairness though I'd nearly died a few years earlier from an unknown condition (in a coma for 2 weeks, respitory/cardiac failure etc kind of nearly died, not just "life flashing before my eyes" nearly in a car accident crap like some people say) so it was probably psychological aftershock from that.