Since being asked to moderate a panel at microstockexpo on workflow, I've been looking at more detail into what workflow means to different photographers. Workflow is essentially just business process, you perhaps can describe workflow as everything you do from image idea to image being for sale.
As a photographer you probably operate on a series of interwoven processes - whether you think it or not. Some processes are simple for a small business and done without thinking (and often don't need a formal process to be conceptualized). Procurement of new equipment, learning new skills, even quality control are often done through 'experience' without too much thought to what is actually taking place.