I love mystery anime with detectives, cute magical girl animes, comedy (the slice of life kind), generally nice slice of life anime (may contain fantasy), 'ganbatte' and yuri. I prefer stories with happy endings. I am always looking for new psychologically creepy horror anime, especially the ones featuring ghosts and ghost stories.
I highly dislike anime featuring high stakes games, splatter or other anime containing excessive violence, mecha or ecchi (the kind with girls with overly large breasts and boys, that have nothing else in mind than groping girls; I find perverted guys like Hideki from Chobits amusing though). I don't like stories with tragic/sad endings very much.