Preaching? ABSOLUTLY...........................NOT!!!!!!!!!!!!! (gotcha didn't I?
God has never called a woman to do that, and HE NEVER WILL! Like I said above, the Holy Spirit won't lead anyone to do something that isn't scriptural. The Bible forbids a woman to preach and gives that distinct call to a man who meets the qualifications. God will not contradict His Word, period.

Leading singing and such? No...because the Bible says she isn't to have the authority over the man. There are usually men in a choir. If she is "Leading" the singing, that means she's leading the men...which means she's in authority, which is unscriptural.

teaching Sunday school: Only if it is young children (boys and girls), or teenage/adult ladies. She definatly has no bussiness teaching men. That goes back to the "no teaching or usurping authority over the man" verse. And I'm not keen on her teaching teenage boys either. They are getting close to adulthood, and personally I think they need a strong, godly male figure to look to. Especially in this day of broken homes where the boy may not have a strong father figure to begin with.

Public prayer in church: I'm not keen on this one either, unless it is only before ladies or children. She doesn't need to "lead" in prayer in front of men in public. Again, I believe that goes back to the authority thing. Now if she's at home and she and her husband are praying together, I think that would be alright so long as they are both praying together.

Hm...can't think of anything else for the moment....