Goosebumps? Fear Street, also, which is another R.L. Stine (Stein?) series. I enjoyed them, and they were what I read when I was like, 10-13. From then, I started reading murder mysteries. It wasn't really until I was about 16 that I started reading fantasy.

I've read 8 books of a series called "Weather Wardens" by Rachel Caine. I'm not proud of that.