But anyone know how to "comment" a blog post, not to let everyone CCed. I receive quite often answers to e-mail I send to several CCed people that don't keep the CCed others.

(by the way, intensedebate really slows your blog, I had to wait for more than 3 minutes to answer this)

The problem with the "mail to everyone" metaphor is that replies to this first mail will probably go to the author, not to eveyone.