The s-word, the f-word. What's offensive? What's not?

I remember hearing a story about Tony Campolo once using the s-word during a sermon just to get his point across. He said something like this: "Most people couldn't give a s*** that 9000 children will die of starvation today (or similar) and you are probably more bothered that I have just said the s-word than the fact that so many children will starve to death."

I was reading Jeremy Del Rio's blog again today and he linked to a great blog written by Tall Skinny Kiwi about just this subject. Check it out here.
Offensive language: I Think My Mother Taught Me