Depends on why you want to blog. If you are in the corporate world, and are trying to market yourself in the job market, not sure if a blog is essential. But if you are an entrepreneur and working on a startup, it is absolutely essential. Its the voice of your company and helps you connect with your community. We're just launching now, but have build a great community over the past few months just by starting our company blog early.

Either way, if you enjoy writing, just do it!