Having kept a solitary blog going (in one form or another) since 2001, I have some experience of this genre.
Having failed to establish PR Studies as a group weblog for all my academic colleagues, I know that there are great barriers to overcome (not least, the ‘not invented here’ issue) in establishing a team effort.
Does this matter when links, comments and trackbacks can allow discussions to flow freely? We can all connect and disconnect at will, so why try to create a club? Is aggregation the answer, as with this impressive team effort from Hill & Knowlton? Or is there a place for a group effort that is moderated and edited? I’ve signed up as a contributor to Forward and I’m delighted to find that the PR student who initiated this project retains control of the timing and content of contributions. It makes sense to me, and I promise I won’t tell Scoble and Israel about it.
PR Studies 
Thank you for joining them, Richard.
You bet they control it and created it. I’m very proud of them. Forward can have a long prosperous future. It is people like you and the other contributors that will keep them going.
They are very happy to have you join in the discussions.
Thank you.
Thank you Richard and Robert!
I certainly do anticipate that Forward has a nice future ahead of it, and my choice to control the content? … well, this is all one big experiment. (But shh! I think people think I actually know what I’m doing!) Seriously, keeping tabs on the content is a strategic choice, and that works great! I’m in constant evaluation mode, however, so if that is the best method for the operation of the site a year or two from now — we’ll see. That’s the fun part! But it’s certainly helping to keep things running smoothly now.
I thought I’d mention this, too. Paull Young was one of the very first contributors I joined up with, and I recall a remark he made pointing out an important benefit of a collaborative blog: with several contributors, the weight of posting is more spread out. So you can have one blog on a specified topic with loads of good content, without that “load” being on just one person.
However, loosely collaborative efforts can come across as scattered and a little hard to follow. Perhaps the best solution really is an organized collaboration.