Via The Atlantic, James Bennet raises good points for webwriters of all kinds, not just journalists: Against 'Long-Form Journalism'. Excerpt:
And, in the digital age, making a virtue of mere length sends the wrong message to writers as well as readers. For when you don’t have to print words on pages and then bundle the pages together and stick postage stamps on the result, you slip some of the constraints that have enforced excellence (and provided polite excuses for editors to trim fat) since Johannes Gutenberg began printing books. You no longer have to make that agonizing choice of the best example from among three or four—you can freely use them all. More adjectives? Why not?
As a writer, I used to complain that my editors would cut out all my great color, just to make the story fit; as an editor, I now realize that, yes, they had to make my stories fit, and, no, that color wasn’t so great. The editors were working to preserve the stuff that would make the story go, to make sure the story earned every incremental word, in service to the reader. Long-form, on the Web, is in danger of meaning “a lot of words.”