This is a nice perspective piece on being a professional science writer and how it relates to training associated with a Ph.D.
When considering career possibilities, it is important to consider your skill set. What skills are you gaining from the Ph.D. process? These are known as transferrable skills.
The University of Michigan provides a nice list of transferable skills generally honed during the process of working towards a Ph.D.
A post on transferrable skills from biology graduate school can also be found in the blog post The Beauty of Transferable Skills: How Grad School Prepares You for Careers Off the Beaten Path
A 2012 NIH report collected data in an attempt to track the career trajectories of Biology PhDs.