Ah, much I have to reply to... I'm happy, because I like the topic very much :D
@Static: Most martial arts are, but certain kept their sense. If you're practising an actual ryu kenjutsu (not just 'kenjutsu', but something like 'niten ichi ryu kenjutsu' (I don't think that's practised anymore...)), you most likely get the real art training, not the new-age simplified version...
Short test for you: Did you train 1 stance (kendo stance), 5 stances (kenjutsu default stances) or more stances (most likely ryu kenjutsu/ga-ryu) ? :D
Well, other sports as ninjutsu were never supposed to be anything but a martial art... there are much downgraded things around, though, for example not training anything but taijutsu... I'm glad I'm in a ryu ninjutsu, so I have the whole program :D
And it's really tough to train with bokken... (ah, I should say bokuto... I always forget :P ) in kenjutsu, you normally don't use any armor at all, so that's even worse, hence kenjutsu requires full-contact training to be effective. Well, shinai are too light for me, I can handle heavier weapons better... (I like my iaito, it's about twice the weight of a katana, and fits my needs quite well).
@Legacy: I somehow can't believe you learned to kill someone, even out of self-defense... and also, if you have the right taijutsu skills (high levels in dakentaijutsu should do it alone), it's easier to defend yourself with bare hands than with a sword if it comes 1-o-1... nindo isn't about killing your opponent, as a ninja, you should know...
For the jutsu and jitsu: Jutsu is the original Japanese name (well, romaji, of course), while jitsu is American.
@Ace: For TKD, as far as I know it heavily relies on footwork and kicks. For a ninja who learns to use every weekspot of the opponent (like short paralysis because you don't have a sure stance with your foot in the air, probably also doing a fast kick sideways affecting your balance), it's easy to interrupt and perform a counter attack, like aiming for the YY point (the opposite side of which the attack targets) so you can't react fast enough.
My advice for you: Use ninjutsu kicks (stick your feet to the ground and only perform kicks to the ankles), do everything else with your hands. That's pretty much taijutsu, but it should work for a TKD student, too, with a little setup :D
PS: Ninjutsu are the only 'true' self defense martial arts, because every other ryu has a system based on 'honor', what can be not to hitting an enemy in the genitals, for example. As soon as these rules exists, the technique becomes useless, because you're harmed in movement.