Using Firefox:
Likelihood of you being FEMALE is 36%
Likelihood of you being MALE is 64%
Site Male-Female Ratio
ebay.co.uk 1.17
icanhascheezburger.com 1.04
gutenberg.org 1.06
google.co.uk 1.35
Using IE:
Likelihood of you being FEMALE is 41%
Likelihood of you being MALE is 59%
Site Male-Female Ratio
amazon.co.uk 1.11
randomhouse.com 0.74
google.co.uk 1.35
harpercollins.com 0.75
Many sites missed here too, and conclusion incorrect (last time I looked!)