Nope , I don't think that Naruto is a clone. I still think that he is Yondaime Hokage's ( a.k.a. Fourth Hokage) son, because, like others said before, he has blond spikey hair, same blue eyes , same blood type( B ), and like Jiraya said , a similar personality as the Fourth, and furthermore Naruto would have been a genius nin if he had been raised in a normal family environment. His normal chakra( without that of the Kyuubi) is twice that of Kakashi and his control is bad only because his body uses some of it to reject the Fox's chakra. On top of this he is similar to the fourth in the fact that he is fast as in the speed in which he moves and , most important , in which he thinks in a battle , always making a good plan for those realy hard one's ( this is shown when Zabuza Momochi trappes Kakashi and even better when he defeates Neji , the supervisor claming that even in that situation Naruto was able to make up a good plan) just like Yondaime. And I am positive he is not a clone since in part II Jiraya said that Naruto was the only one capable of surpassing the Fourth.( One can't surpass oneself... he can only improve). Finally I think that Naruto is Yondaime's son because of the way he wished that "Naruto be seen as a hero"(he isn't the hero title-seeking tipe).PS Sorry about my poor spelling
