Okay another girly subject, but an important one (so boys, not sure if I can exempt you from this, but mercifully for you, it's short. ;) ).
GladRags has fantastic eco-friendly and sustainable products, are based in my local area but ship worldwide, and promote health and education with regard to women's menstrual cycles. They even have been working to bring sustainable solutions to African women (I can't imagine having to stay in the house during "that time of the month" simply due to lack of hygiene products!).
Even better, they're doing a giveaway! Enter to win!