As one of the bloggers at The Gate, I would love to see the comments feature turned on. Blogging doesn't work well as a one-way street. My posts are always meant to be conversation starters.
That being said, having a forum for the blog doesn't really help in accomplishing that. As has been said previously in this thread, you'd want to read the comments along with the blog post.
I also think that I'd blog more often if I was more engaged with the readers. I can easily see comments made by others spurring on ideas and conversations that would evolve into newer posts.

Mordy