What a load of rot. Why do we assume that the reason for the small number of women in I.T must be some sort of oppression / discrimination? That always strikes me as enormously patronising to women. Make your mind up, are women just as strong and capable as men, or not? If they are (and I believe they are) then there's nothing to stop them entering I.T. The many women who already have successful careers in the industry prove this.
I think that the fact there are relatively few women in computing, can be put down to their relative lack of interest in the subject, (measured statistically as a group). I've never understood why it's considered holy writ that men and women must have statistically identical interests. I don't think we do at all, but that's not demeaning anyone's ability - it's just average preferences.