Tom Coates wrote about the history of blog commenting:
I feel like my grandfather when I lurch into language like this, but in those days when people wanted to respond to someone else's post, they wrote something on their own sites and stuck in a link. In many ways I think that we should have stuck with that way of handling communication through webloggia, that we should have dug around and find new ways to optimise that process (รก la Technorati), but when I look online today it's not where we find ourselves. One way or another we have to make do and work to improve the environment in which we find ourselves.
I seem to have been engaging in what Tim Oren calls 'old fart blogging' a bit this week too, but here we go again. What I remember from my early blogging experience was having conversations on group blogs with multiple authors, like Gonzo Engaged and the There was a space missing here. -Fz 8/25/07 8:18 PM 
Small Pieces gang blog  - we'd add multiple authors and post our conversations to the same blog as separate posts.
 
I did finally turn on comments on my main blog  Your blog would be very well suited for comments -- it's not an either/or thing, and I understand why some bloggers find their blogs would just be overrun, which is a good reason to forbid them. But yours has a bit of a "voice in the dark" feel, to be honest.  -Fz 8/25/07 8:18 PM 
when I adopted the new hAtom Blogger templates, and fingers crossed they will stay relatively spam-free. 
Using Google Docs yesterday, I noticed that there is a new 'publish to blog' feature that works with multiple blogging services, so collaboratively edited blog posts with change histories and inline notes can be made, re-edited and republished. This sounds like yet another way of having multiple authors, and worth trying. Do please help me expand on this post about blogging and commenting and conversation.
If you don't know how to do inline comments like this, it's 'Insert' then 'Comment' -Kevin Marks 8/25/07 11:43 AM

Click here to edit this with me in Google Docs (it won't get published back here again until I hit re-publish there)

Hm, this is odd, it won't work on epeus, only on mediagora - it seems to be using the old Blogger API, not the new Atom one, and not letting me select a blog reliably.

Wow, this could be quite neat.  Need to see how it works on Non-Google blogs, I'm affraid Blogger is not for me -Ben Metcalfe 8/25/07 12:09 PM 
the inline comments don't show on the blog; If you put it on wordpress or something, I'd like to try it Ben  -Kevin Marks 8/25/07 12:11 PM
So what happens, does it submit the post via XML-RPC?  -Ben 8/25/07 12:14 PM 
On the publish tab you set up your blog info, and it uses one of the blog APIs to publish it I think most of them are xmlrpc, yes. You could publish it to one of your blogs too-Kevin Marks 8/25/07 12:15 PM

I think it depends on how you (the generic 'you') view your blog: are you firing off idea bursts into the void for other people to pick up or not, or are you trying to promote an ongoing discussion? coComment can help with aggregating conversations from diverse sites, but I haven't played with it to see how well it works in practice versus collaborative editing of blog posts or groupblogs or commenting directly on posts. -Steven Kaye 8/25/07

It says in the very top: "edited on August 27, 2007 7:33 AM by Richard Eriksson".  It's currently 2:

That actually got saved, when I thought I was browsing away and not saving.  Well, it was true, it did say that, and it was more than 24 hours before that time when it said it.  Must have been a bug, because it fixed itself quickly.  (Found out about the unintended saved edit through a Google Blog Search for my full name, incidentally.)

The revision system says people edited it when they opened it for editing without doing anything (it does say no text changed in revision control).