The following is an answer and/or comment by inhahe aka ColorStorm (inhahe.com - myriachromat.wordpress.com).
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I think basically a girl is either interested in a guy romantically or not, she doesn't necessarily have zones in her mind that she arbitrarily places a man in one of, so in that sense there may be a little inaccuracy in how men think of "the friend zone."
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On the other hand, "the friend zone" has much more reality for a guy than for a girl because the guy's always the one pining for the girl, while the girl typically wants no such relationship. The girl keeps the guy and his sexual desires at bay if she's not interested, and the converse isn't as generally the case, so of course the guy's gonna frame this lack of physical access to the girl differently from how the girl is, i.e. he's gonna think of it as "the friend zone."
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Also, I think it gives a little more credibility to the -possibly- inaccurate way that guys view the friend zone, if my impression that this is the case is right, that if a guy befriends a girl and doesn't come across the right way from the beginning (macho? confident? direct?) or doesn't "make his move" soon enough, she ends up seeing him as a "just friend" or as a "brother" forever. This would actually lend some credibility to the idea that there are zones in her mind that a guy can be placed in one or the other of for more or less arbitrary reasons. So the first paragraph may not be entirely correct despite the fact that women would like to see it being strictly that way.
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Edit: And yes, you could (partially?) blame guys for the phenomenon of the "friend zone" because they enter friendships with ulterior motives and/or never have the balls to ask the girl out...
<img src="what_if_i_told_you_friendzone.png"/>
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