I wanted to ask the same question about the difference between Trekkie and Trekker when I first joined this board. I'd just seen the two "Trekkies" documentaries and noticed that there had been some debate on this subject.
I didn't ask because in the end I decided that the whole thing is beside the point. The point being that we all love Star Trek, we all make it a part of our lives and should all just enjoy it. It's not what you call yourself that matters, the important thing is that we have this wonderful thing called Star Trek that brings us together.