Can a woman/female lead prayer?

Is it permissible for women to lead the congregational prayers? Will the prayers of those praying under her leadership be void, if they did unknowingly or were misled? *Background:* [Women promote mosques ‘for all’ in Britain](http://www.dawn.com/news/1035219/women-promote-mosques-for-all-in-britain) *Answers should be backed with some source.*