Sometimes it takes a significant event or change in existing conditions for a business to create a written plan. I think it's safe to say that the state of the economy is a significant change that should prompt business owners to alter the way they've been doing things. If you already have a business plan, it's time to get it out and revise it.
Basically, consumers are hunkering down to limit spending, save money, conserve resources, and change the way they've been living. The major influence on the health of an economy is the psychological state of its consumers.
So, although a detailed business plan may not be required for an online business, I am going to include it here so you can at least look at and consider each section and determine yourself if it applies to your business.
Describe your most important company strengths and core competencies. What factors will make the company succeed? What do you think your major competitive strengths will be? What background, experience, skills, and strengths do you personally bring to this new venture?