(Jumping on the bandwagon with this meme...)
1. Oppressive governments. Chances are, someone's being oppressed or persecuted, and chances are it's by the government.
2. Tough moral questions. I like to give my characters moral dilemmas with no easy answers, and not present an absolute right answer in the story. I also often have my main characters do bad things, while keeping them sympathetic.
3. Spirituality. God, religion, and spirituality have been important elements in a lot of my recent writing.
4. Tragic death. Especially for love interests. If a character has a romantic relationship with one of my main characters, that character has a high chance of dying.
5. Evil mothers. I don't know why, but a lot of the mothers in my stories are evil and/or strange. I don't plan for them to be that way; they just develop like that.
6. Getting into characters' heads. I don't use first person more than third person, or vice versa, and I don't prefer one over the other. It just depends on what the story needs. But even when I write in third person, I stick very close to my main characters, and I'm often inside their heads.
7. Alienation. Most of my characters are separate from the rest of the world in some way, and are separate in a way that the people around them don't know about.
8. People on the run and/or in hiding. They're probably trying to get away from those oppressive governments.
9. People with powers. Psychic powers, magic powers, anything beyond the norm.
10. Not-quite-happy endings. My endings tend to be less "Yay, everything's all better" and more "Everything we care about has been destroyed, but we'll survive... somehow..."