Blogback? Feedblog?

I am new to blogging, as is probably obvious, but I was wondering today whether anyone is using blogs to capture usability feedback? - in particular, are companies that create commercial web sites or business software using blogs to gather requirements and/or feedbback? It seems like a blog would provide users quick access to a forum for expressing their confusion, questions, suggestions, maybe even once in a while - their delight. Also would be an easy way for designers to communicate directly with their users, and even get a dialogue established.