We have watched an short movie, explaining the definitions of Otaku culture. It was very interesting to see the otaku culture from the English point of view.
Well, I would just like to explain my own definition of Otaku. The word "Otaku" is a people who are into something, and it could be anything.
Anime Otaku is probably an well known Otaku to everyone, but these days , "Reki Ota"(Japanese History Otaku), "Johni Ota"(Johnnys? Otaku)and other Otaku are maybe the hot Otaku now. To conclude, there are many kinds of Otaku, and even we could make a new Otaku word!