Giftodd, you really need to read Lise Eliot's article with which ultramarina started the thread - the stuff you're talking about here is practically all among the "myths" of neuroscience that she debunks in it. It looks to me as though you don't need a subscription to see it:
http://www.springerlink.com/content/c63105666nw1788k/fulltext.html

I think the key point to be aware of is that even when there are statistically robust differences between male and female brains (and many of the best known ones are mythical) the intra-sex variation is in (practically? I know no exceptions) every case greater than the inter-sex variation, which makes the finding of very limited usefulness when it comes to dealing with individuals.

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