To clear up some air of misunderstanding, for god sake.
1)Jeet kune do is not a martial art whereby all the moves are invented by him
2)Jeet kune do is a combination of martial arts(western boxing, savate(French kickboxing), wingchun..etc etc), using footwork from fencing as well.
Jeet Kune do is a mixture of martial arts, whereby you throw away whats impratical and you use what is pratical.
An Extract from http://en.wikipedia.org/wiki/Jeet_kune_do
JKD advocates taking techniques from any martial art; the trapping and short-range punches of Wing Chun, the kicks of northern Chinese styles as well as Savate, the footwork found in Western fencing and the techniques of Western boxing, for example. Bruce Lee stated that his concept is not an "adding to" of more and more things on top of each other to form a system, but rather, a winnowing out. The metaphor Lee borrowed from Chan Buddhism was of constantly filling a cup with water, and then emptying it, used for describing Lee's philosophy of "casting off what is useless."