I'll add that on my Wordpress blogs I get some comments (past the Askimet spam filter) that seem juvenile in tone, without trying to advertise anything, but trying to act intimidated by the nature of my material!
There's one other thing. I don't generally publish other people's original essays on my blogs (I get requests); I normally suggest that someone get a free blog and post his or her piece on that blog and provide a link. I am interested in joining with other companies or journalists in a more systematic manner, however. Some people are taken back by the idea that I am hesitant to open attachments and jump in the deep end of anyone else's pool.