Writing Excuses – A fantastic podcast run by authors Brandon Sanderson, Dan Wells, Howard Tayler, and Mary Robinette Kowal. Each podcast is “fifteen minutes long, because you’re in a hurry, and we’re not that smart” and full of great information and inspiration.
Fiction Writing Tips – A Tumblr run by Kris Noel, a young adult writer.
Larry Correia – Writer of the Monster Hunter series and many other best selling books. Check out his “Ask Correia” blog post series for tips.