Writer’s Digest offers a writing magazine, writing workshops, writing contests, and much more.
To find a list of agents, advice, and other resources, visit http://www.agentquery.com/.
Nonfiction Authors Association is a must for those who write nonfiction. They offer podcasts, Twitter chats, and more. http://nonfictionauthorsassociation.com/
Author’s Guild offers legal services, advice, resources, and more.
MeetUp.com can connect you with other writers, book clubs, and more.
Publishers Weekly is the best news source for anyone in the publishing industry
National Writer’s Association has local chapters and national resources.