‘Soy’ has become a very controversial area with many opinions and biased (pro and con) articles out there. The benefit of whole soy food is real, although not miraculous. Soy is often criticized based on data on looking at high doses of soy extracts used in a Petri dish or in nude mice.
Kathleen Head N.D. provides an excellent, scientific summary on soy and its constituents.
Power Surge discusses phytoestrogens.