There are many benefits to writing a blog related to your graphic design business. Aside from the overall benefits of writing in general (they say it will make us smarter), a blog can help to:
Promote Your Business: Show potential clients that you are active in the design community and knowledgeable on design in general.
Drive Traffic to Your Website: Improve your search rankings with a frequently updated website.
Build a Community: Get to know other designers and creative professionals through commenting and discussions related to your blog.
Establish Yourself as an Expert: Share tips, tutorials and business advice with the outside world.