Writing for the Ear is different than writing for the printed page. Even though this article is aimed at creating copy for young audiences, I think it contains some universal principles.
Here's another good one.
And here's an article on the guy they call "The Host Whisperer". I think it contains good material for both readers and writers.
I've added my own thoughts about writing in this article (found on the "info" section) called "Writeyness."
Thanks for reading!