If you want to blog for your business, and you should, WordPress is a great tool. You can use WordPress to build a blog for your business and for your professional website. However you do not want to use WordPress.com for your business.
I have been using WordPress since 2005 and never looked back. All my websites are built with WordPress and are doing pretty good on traffic via the search engines. Content is part of it and the correct technical structure of the page is another important part.
You have to take care of great content, so take time to write the best content. WordPress will take care of the technical part.
If you are going to use WordPress, remember two critical issues: