On my 'Summer vacation' 2 yrs ago I read the entire tome of 'The Rise and Fall of the Third Reich' bu William Shirer,
http://www.amazon.com/gp/product/0671728687/103-2117786-7769 441?v=glance&n=283155
If you have the time - a VERY INTERESTING read,
A few of the most interesting things: how they went from a marginal group everyone considered crackpots to taking over, it was so slow, manipulative and methodical that before anyone noticed what was really going on, it was too late,
How easy it was to manipulate the populace with propaganda & lies,
How Adolf was clearly completely nutso and making disastrous strategic errors (like waging war on too many fronts), yet the Generals would go along with it because he was the leader,
Like Compass Point referred to - how history repeats itself