Blog Business World has a post on how to promote a business blogs by posting commentary on other sites.
"One proven technique, that is well known and practiced by the internet marketing pros, is posting on internet message boards and forums. By posting on the message forums, savvy marketing people gain visitors, establish themselves as experts in their field, and multiply their success many times over. You can too.
All you have to do, is start to think like a marketing professional. The internet discussion boards, and even some of their other members, will do much of the marketing on your behalf."
