Blogs are gaining momentum in the business world and are a great way to promote your business or product. I don't do much active advertising for my blogs, but get decent traffic considering. If you have a business whether online or offline, I highly recommend having a blog where you can post special offerings or sales. You can even provide insight, trends, and news regarding the industry that you work in. Best of all, it's FREE advertising :)

I came across a great source to read if you're new to blogging - courtesy of Lovell Technology. It's called "Blogging Made Easy". Click the link to download: http://www.lovelltechnology.com/zip_files/blogging.pdf

Other great sources on blogging:
The Weblog Handbook: Practical Advice on Creating and Maintaining Your Blog by Rebecca Blood

Blog : Understanding the Information Reformation That's Changing Your World by Hugh Hewitt

Buzz Marketing with Blogs For Dummies by Susannah Gardner

Publish and Prosper : Blogging for Your Business by D.L. Byron, et. al.