The iron maiden as defined by yahoo! Education (and various other sources)
NOUN: A medieval instrument of torture consisting of an iron frame in the form of a person in which the victim was enclosed and impaled on interior spikes.
So the victim was enclosed in a device in the shape of a woman. So here is an idea of what an iron maiden looked like back in the day

http://upload.wikimedia.org/wikipedia/commons/5/56/Iron_Maiden_of_Nuremberg.jpg
According to Jacobsen and Mazur this is what the Iron Maiden of today looks like.
http://img2.timeinc.net/people/i/2007/stylewatch/fashionfaceoff/070312/mischa_barton300.jpg
How are you feeling about yourself today?
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Dream Theater is in the studio again, and I can’t wait to see what magic they produce!