A.I. Love You (By Ken Akamatsu), has a similar theme to Chobits, but this came first by over five years.
A Romance/Comedy, A.I. Love you is the story of Hitoshi Kobe, an unfortunate geek living by himself while attending highschool. He has bad grades, and is bad at sports. Basically he's your average main male romance character. He also makes advanced A.I. Programs. His latest one being Number 30. A lightning storm hits his house, and something causes the program to come out of the computer, completely naked of course. This is a great series, it not only touches on many of the topics of Chobits, but has a good romance story too.