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"Use no way as a way, No limitation as a limitation."...Bruce Lee

Jeet Kune Do--the literal translation is "way of the intercepting fist"--was conceived by Bruce Lee in 1967. Unlike many other martial arts, there are neither a series of rules nor classification of techniques which constitutes a distinct Jeet Kune Do (JKD) method of fighting. 
He wanted to make sure people didn't interpret Jeet Kune Do as a new style, because it is by his own definition meant to be the freedom from styles.

One of the main things that separate JKD from other forms of martial arts is the footwork. Most other forms of martial arts is practiced in a stationary or set position.The movement of JKD however is much more like boxing, a constant jumping on the balls of your feet. Arms up are like a fighter, not in chamber around the waist. Which is why it makes it a perfect Martial Arts to cover during my self-defense month. The constant movement and strong attacks makes JKD a powerful street fighting technique. And the continual motion makes it easier to maintain a defensive position. Because of this, JKD is referenced in many fighters training.

No art is superior to any other. That is the object lesson of Jeet Kune Do, to be unbound, to be free: in combat to use no style as style, to use no way as the way, to have no limitation as the only limitation. Neither be for or against a particular style. In other words, Jeet Kune Do 'just is'. 

Below is an 18 page document about Jeet kune do written by Bruce Lee himself
Click Here to download, Word Document, 189K