I personally am afraid of the idea of not existing anymore. Mostly for selfish reasons such as I think I'm too young and have too much to offer the world, but some non personal reasons as well such as the emotional trauma inflicted upon my family. I don't fear what is after death for I know there is nothing, and I don't necessarily fear how I die, I'm just not too approving of a painful method, although pain is only really realized in retrospect, so I doubt it would affect me too greatly. I also realized while typing this that I used the word 'too' quite a lot. Interesting poll, I'm eager to see the results as more people vote.
Brevity is the soul of wit.