Kuroshitsuji is a shounen manga series with a hint of the supernatural by Yana Toboso which will sometime be turned into an anime series this Fall 2008. The story is about Sebastian Michaels, who has got unquestionably perfect knowledge, manners, talent with materials, martial arts etc, who is serving a young master, Ciel Phantomhive. The reason for Sebastian to be so talented is the fact that he is actually a devil. He has made a deal with Master Ciel which means he has to do everything Ciel commands him to do.
I’ve been enjoying reading this since the art is clean and beautiful, and the story has potential, with all of the mystery surrounding the various characters and their motives. I also found this quite similar to Hayate No Gotuku. It features a butler taking care of a young noble (..well, except that they’re both males). The series itself is dark, violent, and bloody at one point, but it still has some touches of comedy.