I find this quite interesting. It shows what hormones are turning into which other hormones by which enzymes. You can see that Testosterone is what makes Estradiol and that Progesterone is a precursor for both Estradiol and Testosterone as well as other hormones and you can see DHT coming from Testosterone (it is what causes all the masculinization in the body, in the womb it even causes penis growth, later it causes hair growth and hair loss)

So for all bio nerds:
http://www.kegg.jp/kegg-bin/highlight_pathway?scale=1.0&map=map00140&keyword=estradiol

  VERY COOL! THANKS.

This is a much simpler representation of much the same thing:

http://ceri.com/q_v7n2q3.htm

Neat - yes that is simplified but detailled enough for the most important information and it includes the enzyme names. Thanks