A few bloggers and newsletter sources that I have found helpful. Please post any you might be particularly fond of to help this list grow.
Writer’s Digest: Free newsletter that has great info on all phases of writing and publishing.
James Scott Bell: Author of How-To writing books and thriller fiction
Nephele: Agent for The Knight Agency
Chuck Sambuchino: Great information about agents, publishers, and keeping abreast of the changing marketplace.
James Robert Brewer: Poetry blog, but useful items for fiction writers also.