I never really cared that much about reading manga but I've heard a lot of fuss about Deathnote. After seeing it in a comic shop I decided to gamble on it, went home and found Amazon to be doing it for a good price and bought all twelve volumes. It's really fantastic, and I'm very impressed by it. Over the past two days I've already got through the first nine volumes, the art is of a high standard, especially when compared to my previous exposure to manga, and the quality of the story and writing is really something. I always thought that plots in things like this were passable rather then compelling, but this clearly proved me wrong.
From what I can tell it was written in 2003 / 2004, so I know I'm not 'in touch' with what's hot, but if anybody can recommend any mangas that are similar in terms of quality and storytelling to this one I'd be interested in hearing about it.