one of my new fav. manga/ anime series ever! This is like the biggest case of irony ever! here's the wikipedia definition:
The Melancholy of Haruhi Suzumiya follows the high school life of Haruhi Suzumiya, a young and very active high school girl, and those who are caught up in her antics. While Haruhi is the central character to the plot, the story is told from the point of view of Kyon, one of Haruhi's classmates.
Kyon is an ordinary freshman high school student who has recently given up his fantasies of espers, time travelers, and aliens as he left middle school. When he chooses to speak to Haruhi, he unwittingly sets off a chain of events which drag him into surreal situations; he is drawn further into a world eerily like the fantasies he had just managed to outgrow, with Haruhi at its center.
Searching for a group that interests her, Haruhi joins and quits every club in the school, finding only dissatisfaction. Kyon makes a snide remark about her actions and accidentally provides Haruhi the inspiration to create a club of her own. To help start the club, Haruhi forcefully drafts Kyon, who only stays in the club to protect other helpless victims of Haruhi's "voluntary arrests". As the story progresses, Kyon finds that each of these supposedly "helpless victims" has a specific reason to be there. The first of these new members is Yuki Nagato, a silent bibliophile who usually wants to simply be left alone to read. Without Haruhi knowing, Yuki is in fact a "humanoid interface," or an artificial human, created by the extraterrestrial Integrated Data Entity. The next member is the shy and timid Mikuru Asahina, who is one year above Haruhi; she is actually a time traveler. The final member of the SOS Brigade is Itsuki Koizumi, who is almost always smiling and more than willing to give in to Haruhi's strange demands. He turns out to be one of many espers in an organization known as the Agency. Except for Kyon, the members of the club are secret agents of various organizations who are sent to observe Haruhi. They gradually explain that Haruhi has superhuman control over every aspect of the universe—an ability which she is unaware of. Whenever Haruhi becomes bored or otherwise dissatisfied with reality, she unconsciously creates a new universe—one more to her liking—and attempts to switch over, thus leading to the destruction of the current universe. In order to prevent this, the members of Haruhi's club spend their time attempting to keep their god-like leader entertained, hold her powers in check, and maintain the illusion of a normal life.

Here is my definition:
Freakin' awesome!!!!!!!!!!

If you want to see the first 12 episodes in English go here :[link]
If you want to read it then go here :[link]