I guess its more about having your "OWN" Space.
I would also imagine the ability to approve and reject comments.
With out being a moderator or such.
A Space to let people know whats happening in your life
in one place, your place. And not just a topic that drifts
to the bottom, and awaits the next update.
I have a blog,
and its cool, but i do think its a feature a forum has to have
as the likes of face book and alike have proved there success
just like forums do. So a Forum and a Blog can only be a good thing.
Well that's my take on things.