Thanks to former :( blogger Out of Step Jew for bringing this fascinating link to my attention. There was a dicussion thread on a Charedi internet forum called Bechadrei Chadarim about whether or not it is permissable for a woman to deliver a dvar Torah in shul.
There are actually a range of interesting responses, and if you are interested go and have a look. The one which I found most interesting brought the following responsa of the Satmar Rav who said it is totally forbidden for a woman to speak in a shul (see image below). However....
This commenter also wrote the following:
דברי האדמו"ר מסטמר נראה שזה איסור חמור
הפלא
הוא כשנפטר האדמו"ר מסטמר אשתו הרבנית הספידה אותו לפני מטתו כחמש דקות
בבכיות על רם-קול בהיכל הבית הכנסת הגדול במונראו קרית יואל לפני אלפי
חסידים ומאות רבנים. [הייתי שמה ושמעתי אותה]
ויש טייפים מהספידה.
In short: Even though the Satmar Rav said it was strictly forbidden, his wife, the rebbetzin eulogized him at his funeral through a microphone in the heichal of the synagogue (in Monroe, Kiryat Yoel) in front of thousands of chassidim and hundreds of rabbis (the commenter says "I was there and heard her.") And there are copies of her eulogy. 


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