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."