The Bible does say (apostle Paul, to be exact), that he does not suffer a woman to teach in church. This doesn't mean teaching in Sunday School, but doing an active preaching from the pulpit in the main service. Some people do say that there's "equality," but the verse is actually taken out of context. There is equality in the sense that we are equally sons and daughters of God, all saved, but remember: God didn't made everyone apostles, nor everyone teachers, etc.
God gave man and woman different roles. When Moses' sister tried to take a role that belonged to man, she got leprosy (sp?).
Regarding the verses in Acts where Mary is included among the ones speaking tongues, from the context we see it was not a stabilished church: Paul hadn't entered in the scene still, and the church per se was unexistant. The Bible mainly addresses that only men are to be pastors, and they should not try to usurp men's role, as well as not gathering their own teachers (and this apply to worldwide Christians, not only women) according to their desires (2 Tim. 4:3-4).
I wrote about this in a more extense way some months ago, and all it did was bring up great controversy, although the Bible was already clear on what roles pertained exclusively to man. If anything, you could consult the following link:
http://www.carm.org/questions/womenpastors.htm 
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