Grrrrr. Unfortunately, Leslie Epstein's "Tips for Writing and Life" in the March/April 2010 Writer's Digest is not available online. If you write creatively, for business, or frankly any way at all, read his 20-years-in-the-making "tip sheet." Filled with little simple correctives, like spelling "all right" like that; pointers on punctuation; and the final self-aware confession that he violates "a good many of these rules." All good writers break the rules. You have to know them to break them properly and these, perhaps, 2500 words will help you compile the list.
Claims to fame: Epstein, whose written a stack of books, essays, plays and such, heads the Creative Writing department at Boston University; his wife, Ilene, is a partner in The Studio, the great women's clothing boutique in Brookline, MA; and their son, Theo, is general manager of the Red Sox (needs no link).