Hayate The Combat Butler.

"From AniDB:
16-year-old Hayate is really down on his luck. Because his unemployed parents are good-for-nothings who waste what money they have on gambling, Hayate had to start working at a young age to help out his family. Although such experience has made him inhumanly fast and tough and skilled at things boys aren`t normally skilled it, it has also left him in an awkward position, as his parents have racked up such a huge gambling debt that they have sold Hayate to the yakuza for the value of his organs. In a desperate attempt to avoid that fate, Hayate decides to become a “bad guy” and kidnap someone to be held for ransom, but his efforts to do so are mistaken as a confession of love by the girl he targets. When he helps save the (as it turns out) ultra-wealthy 13-year-old Nagi from real kidnappers, she takes him in and gives him a job as her new personal butler (and love interest) until he can pay off his debt. But Hayate is more attracted to Nagi`s beautiful teenage maid Maria, and head butler Klaus is initially disapproving of the boy with such a poor look. And then there`s Nagi`s pet Tama, who is also a force to be reckoned with."

Just recently found this and it was surprisingly good, it felt like a combination of many other series and it has a huge amount of reference to other anime/manga. I recommend this to anyone that enjoy stuff like School Rumble.

you can get it at www.mangatraders.com