1. Ouran High School Host Club - It's quite hilarious and cute. The character developments are interesting as well as the plot itself, even though at some point it seems random. The artwork is fantastic too and the characters are very cute. It's the first harem shoujo series that I've ever taken liking to.
2. Law of Ueki - It's funny! Really! Though I like the characters' appearances better in the anime, it's certainly still interesting. Though once in a while I might get tired of the "justice" talk, in the end, it proves to be a good thing anyway and becomes the very reason that characters change in a good way. It's a bit cliche but it's a has a great plot all in all.
3. D.N.Angel - I honestly prefer the manga development rather than the anime. The plotline of the manga is exciting and in my view, the art is better. The characters are just too cute :P
I hope I made sense there. This is my first post