It's really not worth noting the controversy which led up to this, but Peter Leithart's post here on vulgar language exactly echoes my own sentiments. As a baptist youngster I certainly bought into the idea of prohibited words, but through college and beyond I began to reason out many of these same ideas Peter mentions. I think there must be some sort of Aristotelian mean here. One should not be the sort of person who is known for telling dirty jokes, but one should not be a prude either.
Working with high school students over the last few years has made me both more sensitive to this question and more convinced of the general position. Also, being pastored by David Bowen, one who is not the least afraid to either mention a vulgar word in a sermon or to preach on sexual passages in the scriptures, has been helpful. I can't say often enough that I have the best pastor in the world :)