Customer Facing vs Dark Blogs; Blogs vs. Wikis
by Ron Lichty
That's emerging terminology for blogs behind the firewall.
There's more in this internet.com article on dark blogs as well as those that are customer facing, in the context of the first hours of the Supernova conference, a conference focused on "the decentralization of computing, communications, digital media, and business."
Meanwhile, Lee LeFever has added to his insightful differentiation of blogs and message boards with "A Blog Post Says 'Here It Is, Dig It'".