I wanted to post something to support the belief that Tobi and Obito Uchiha are the same person.
Fact #1: Tobi's mask has one eyhole, and it just so happens to be in the same spot as where Obito's one remaining eye would be. (Remember he gave his other eye to Kakashi)
Fact #2: The fact that Tobi wears ALL THOSE CLOTHES and moves in the particular way that he does could be the result cover up a mangled, scarred body. Remember that Obito got smushed by rocks? Yep. And at the time of Obito's 'demise' there were at least two members of Akatsuki who knew techniques to preserve and/or revive a body. (Sasori and Orochimaru)
Fact #3: The names! In Japanese, Tobi spelled backwards in Japanese is Obito without the 'O'. Even the basic name structure is alike (O-B-I-T-O, T-O-B-I)
Fact #4: The hair colour/hair style of both characters is pretty much identical. Obito and Tobi both have spikey, shortish black hair.
Fact #5: Tobi's memory loss could be easily explained by Obito's being crushed by rocks. The trauma could have erased his memory.
Fact #6: Obito was last seen being crushed by rocks in Grass country/village, and Tobi is seen traveling with Grass ninja Zetsu. Also, Zetsu could have stumbled upon the young Obito while traveling (he travels the most).
Fact #7: Both Tobi and Obito Uchiha are clumsy, or at least it appears so.
I've recently realized something about Tobi's 'weird clothes' and stuff, as in those 'buttons' on his clothes. Yeah...those are screws. As in 'screwed into his bones to hold his body together' or something like that.
Tobi's mask is ORANGE. Obitos goggles were ORANGE.
There is other evidence, but these facts are the most descriptive of the Tobi=Obito theory. If this theory is in deed true, then if Tobi and Kakashi fight, they may both remove their masks
THINK ABOUT THIS THE JAPENESE DONT PRONOUNCE THEIR T'S AND L'S AND TOBI IS OBI AND MEANING OBITO... THINK ABOUT HELSING IN THE JAPNESE VERSION..... IT'S ARUCARD AND AMERICAN IT'S ALUCARD MEANING TOBI IS REALLI OBI MEANING OBITO U FEEL ME
THINK ABOUT IT!!!!!!!!!!!!!!!!!!!!!!!