@Grivusangel -- Sigh. I guess that's why I'm an old school grammar nazi. You can throw around terms like "relational grammar" all day, but you still have to illustrate it, and like you, I think the best way is to learn diagramming.
At least, people need to learn good grammar habits, which will help them in every field. Relational grammar is one of those things one learns along with good grammar, without really breaking it down into a subject of its own. Learning proper syntax and grammar is learning relational grammar.
I remember reading an column where the writer had caught a snake (rat snake, I think) and had it in a jar. He wanted to express that, when he reached into the jar to retrieve the snake, it wrapped around his arm and started squeezing it. However, because of the way he constructed the sentence, it indicated the *jar* was squeezing his arm, not the snake.
He was unhappy I had edited his work, until I explained to him what the sentence was really saying. Then, he seemed to understand that dangling modifiers and participles all over the place creates confusion. He was just, "writing like normal people write, not like some fancy English professor." I told him that constructing a sentence like he did was more laziness and not wanting to proofread his work than "writing like a normal person," and we didn't expect English professors at the newspaper. We just expected decent grammar and sentence structure. He didn't like it, but he did make more of an effort.