2011 marks the centenary celebration of International Women's Day - a 100 years over which the world has seen women emerging from  disenfranchised status to one where they have representation in the top ranks in diverse spheres - in governments, industry, education, sciences and other social sectors.

Incidentally, this year Women's Day focuses on the theme Equal access to education, training and science and technology: Pathway to decent work for women

(Also check out: Five Women CEOs who inspire)

As we celebrate the accomplishments and achievements of the truly fairer sex, and explore ways that will enable better employment opportunities for them, here is a look at the top 10 among the most recent Fortune list of '100 Best Companies to Work for,' in terms of proportion of women in the workforce.

Take a brief look here at what makes these companies such great places to work in: