Some are pushing for the government to apply Title IX to science education. John Tierney wrote on Tuesday an article about this; he??offers more on his blog.
You'll find sweeping assertions of discrimination in academia against female scientists if you read the executive summary of the National Academy of Sciences' 2006 report, which was issued by a committee led by Donna Shalala. But if you look in the report for evidence of bias, you find studies showing that female graduate students in general (and those without children in particular) are as likely as men to finish their studies, and that they're as likely to have mentors and assistantship support.