BEST!
After going along with the herd with INFJ for a while, I think ISTJ is a much better type call for Hitler. So much better that I thought of creating a new thread on the topic, but then I decided to bump this one instead.
As always it is necessary to state up front that not everybody goes along with their type. But in this case, Hitler's belief in the existence of "golems" demonstrates the presence of an inferior function related to Si: his inner world was full of strange objects that he believed existed in reality. "God" might be considered one of them, but for Hitler it is just a conservative Si belief that coincides with being raised a Catholic.
The idea that Hitler was an INFJ because he had a desire to produce artworks is a false stereotype. In fact, his primary desire growing up was to join the Catholic priesthood.
Hitler's nationalistic fervor is Si at its worst.
If Hitler was an INFJ or ISFJ, the Fe is not very apparent. But the Te is very apparent. It gave him the ability to amass and organize vast armies, and perhaps also the ability to manipulate his audiences through his fervent git'r'dun speeches.
ISTJ Motivational Posters:
http://www.youtube.com/watch?v=Mqv7StpErdk