One of my favorite pieces on writing is "Effective Writing for Army Leaders," available at http://www.au.af.mil/au/awc/awcgate/army/p600_67.pdf . They have hilarious side-by-side comparisons of poor and good writing, such as pg. 13 and 14 (pg. 7 and 8 by page number). I found this during a brevity kick I had after reading David Sirlin's "Writing Well."