From the Florida A&M University Division of Journalism site:

In their pursuit of clear, concise writing, journalism students sometimes develop the habit of writing everything in short, choppy paragraphs that are unrelated to one another. Reviewing any good high school writing handbook will remind you that considerable thought has been given to how longer paragraphs can be developed into well focused presentations of single units of thought.

It sounds dry, but check it out for some good basic writing advice, especially if you're having a hard time making your writing seem cohesive. I like any article that advises "Never define anything by the "according to Webster's" method. Meaning is found in the world, not in the dictionary. Bring the world into your story and use it to define your terms."