RLComputing uses WordPress and DotNetNuke blogging software for our clients. This software has a lot of flexibility and is free.
Why blog for business?
From a business perspective there are several potential reasons to blog. The results you can expect from blogs is mainly about stronger relations with important target groups. In a blog your main objective not is to sell, you'll develop a more personal relationship between you and your customers. Blogs are a fast way to join the customers' discussions, provide tips and insights or receive feedback.
Examples of WordPress blogs:
Other Blogs using DotNetNuke: