I wouldn't say I have a fear of the dark, but rather I have a fear of what lies behind the dark, or what could be lurking in or using the dark to its advantage. However, I find that if I spend the night with a friend or have a radio on I feel a lot more at ease than when I sleep alone in the dark, and to be honest I cannot remember the last time I slept in pitch black without a radio/tv on in the background or with a friend in the same room. I think that the fear is the idea that bad things happen in the dark/quiet, therefore, when I'm in the dark and alone, I get scared that something bad will happen to me or to the people around me. I remember having several nightmares as a child of me being tied up while someone I cared about was being assaulted in some fashion.
I also have a somewhat large fear of being truly hated. I'm fine with people not liking me or even saying bad things about me, whether to my face or behind my back, I might get mad about the comment for a moment, then forget about it. But I have a fear that I will make a huge mistake and somehow all of the people I care about will turn their backs on me and hate me.
I have some odd fears, but I guess to each his own.