Yeah, i know the arguments’ve been beaten to death.. Anyway I came across this article, which I believe covers the argument quite well. Its in pdf btw..
Download here
On March 18, 2005, for perhaps the first time in the history of Islam, a woman delivered a khutbah and led a mixed congregation in Jumu’ah prayers. Although this action was clearly at variance with Islamic teachings and the consensus of the Muslim Ummah, attempts have been made to legitimize it. The most notable of these is a piece by Nevin Reda, available on the Internet.
Sadly, Nevin Reda’s arguments have convinced a number of Muslims of the admissibility, or even desirability, of such prayers. This essay is a response to those arguments.
Taken from here