Preditors & Editors protects writers from scammers by providing a comprehensive list of reliable editors. They have a host of valuable information on their site: www.pre-ed.com.
Positive Writer offers endless encouragement for writers of all levels because writing is a solitary and challenging career! www.positivewriter.com.
Helping Writers Become Authors is a great site. There are lots of authors out there dispensing advice on writing but K.M. Weiland does it really well. www.helpingwritersbecomeauthors.com.
Write Nonfiction Now is a good resource for nonfiction writers. There are lots of resources for fiction writers but precious few for nonfiction writers so I feel it is worth pointing out. www.writenonfictionnow.com.
Agentquery.com is one of the largest databases of literary agents on the web. If you want to be traditionally published, you need an agent. This site has current and comprehensive information. www.agentquery.com.