I wouldn't use one of the free blogging services unless you are really desperate. You can't be sure if they will always remain free and your posts will be building up someone else' asset rather than your own.
Blogging is fast and easy. If you can use notepad you can blog. The user interface is very intuitive and allows you to add and edit, text, pictures, videos, whatever you want. Want to change the look and layout of your blog? There's literally hundreds of themes available that take less than a minute to upload and install.
It gives you products and services personality. People like to do business with people they like. By blogging you show your target market that there is a real person behind the company you represent. By reading you blog posts thet get an idea of what you're all about - warts and all. The personal aspect of blogging is one of it's most powerful characteristics.
Your blog becomes another Internet asset. Some blog sites get thousands and thousands of readers each day. This traffic can be converted to hard, cold cash through Google Adsense advertising, affiliate programs and straight advertising space sale. Once you blog increases it's Google PageRank, you also get the benefit of linking out from your blog site to other web sites you want to promote.
Search engines just love blogs. It is said in many SEO forums that Google staff are great bloggers and subsequently Google spiders and indexes blogs more frequently that normal web sites. This may just be a rumour, but I have found it to be true in my case. If you blog every day there's a good chance Google and the other major search engines will spider your blog every day looking for that new content.
Convinced? Give blogging a try. There's stacks of free resources listed in article directories like this one that will help you get into blogging.

About the Author

John Hacking is Marketing Manager for a Brisbane web site design company and Product Manager for a Brisbane SEO firm. He has just started an Australian SEO blog.