Women and Salaries

My negotiation research tells me that women continue to earn less than men doing the same job and it is probably getting worse in 2009. The reason for this is probably -
1 - They are generally more trusting in the system
2 - They are less competitive than men doing the same job
3 - They are less likely to ask / haggle for a rise than a man

If you have any comments additions to my findings please email me and I will look into them