We have a definition problem here: What is a business blog, waht a corporate blog, what a general blog about a business topic?
I'll try to use this definition:
If a blog serves to show or promote the competence of it's (knowledge-working) blogger(s) regarding a certain field of expertise or the quality and usenfuless of their products or services, then it is a business blog; no matter if it is in a corporate context or written by a freelancer. So it is a means of customer- and peer-communication. Or call it: PR.
If it 'just' collects and comments items from a certain area of business (in which the blogger may or may not be active), it's "just" a blog with a business topic. If it is a blog a person tries to make a living from, it IS a business, but not in my definition a business-blog.
You will find other business blogs in other blogrolls.
*
bwblogs (some of them)
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journalists
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advertising
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writers (mostly German)
* I have unpubished blogrolls of 'a-blogs' that needs more work and contains some business-oid pages and of one roll 'Internet'-Blogs that are often run by IT-freelancers but also contain normal news-feeds.
Suggestions are welcome, please post them to the comments.