Online

Publishing 101 Useful Information I've culled along my writer's journey (Work in Progress)
Literary Marketplace Tons of listings for agents, publishers and more
WritersNet Forums for honing your craft, publishing advice, genre specific topics and writing events
Kirkus Reviews Get Your Book Reviewed (There is a fee)

Hard Copy

Writer's Market Where and How to Sell What You Write
Novel & Short Story Writer's Market A more specific version of the previous entry
Jeff Herman's Guide to Book Publishers, Editors and Literary Agents The title says it all
Guide to Literary Agents Updated Annually
International Directory of Little Magazines and Small Presses
Writer's and Artist's Yearbook
1001 Ways to Market Your Books John Kremer
Marketing 101, 104, 106 & 107 John Kremer
Marketing Your Novel 101 John Kremer
Guerilla Marketing for Writers Jay Conrad Levinson
Publish to Win: Smart Strategies to sell more Books Jerrold R. Jenkins
Get Known Before the Book Deal Christina Katz
On Writing Stephen King
Self-Editing for Fiction Writers Renni Browne
Telling Lies for Fun and Profit Lawrence Block
Tips for Blogging for Writers Robert Lee Brewer

Ink & Insights Have your novel critiqued by four judges. The feedback alone is worth entering!

Wattpad A Great Place for Writers to gain readers and posting online-only stories.
Kindle Direct Publishing Good opportunity for self-promoting and gaining readership.