My favorite sites Bob Baker's Newsthinking Bob Baker, author of the book Newsthinking, is a Los Angeles Times writer. His Web site is a great resource for writers who want to learn.
Training Tracks A column by writing coach Steve Buttry. Check out his handouts for workshops. And check out the rest of this site.
You Don't Say John McIntyre of the Baltimore Sun writes about language and copy editing.
Common Sense Journalism--the blog Excellent commentary by journalism teacher Doug Fisher. And read Doug's column, also titled Common Sense Journalism, here:
http://www.jour.sc.edu/news/csj/index.html
Writing-World.com Moira Allen has an enormous amount of good material for writers. A couple of my articles are archived here.