Unless you are naturally a great speaker, writing like you talk is bad advice in my opinion. I, for example would sound erratic and incoherent if I wrote how I talked. I sometimes say things without thinking quite a lot. At least when I write, I can think about things more clearly, research what I am saying and get my facts straight.

I usually agree with most of what you say PG, but in this instance I think you're wrong. Still, it was an interesting read nonetheless.