One resource to recommend is the AAUW Legal Advocacy Fund.
LAF has a long history of fighting sex discrimination in higher education, and in 2004 published a summary of several cases in "Tenure Denied." Download the full report.
In the last couple of years, LAF has stopped providing support for individual plaintiffs, but it does maintain a network of attorneys who are experienced in such cases and willing to discuss options with potential plaintiffs.
See these resources for more information on tenure issues.
For those of you in a position to be more proactive, check out LAF's campus outreach program to bring a gender-equity focused program to your campus.
If you're female and you're not already on the Systers email list, I recommend it (though only in digest form... it gets a lot of traffic).