[thelist] Blog software for running multiple blogs

[Richard Livsey]

Does anyone know of blog software capable of running multiple blogs?

I'm after setting up a network of blogs, kind of like msdn blogs, 
whereby we can easily create new blogs on the fly.
Ideally then we have one main summary page showing the last x posts and 
comments from all blogs, statistics on them all and individually etc..
Authors should be restricted to their own blog but have some kind of 
permissions system whereby we could setup users who can post on multiple 
ones.

Preferably based on PHP and mySQL, or Python.

Anyone know of anything along these lines before we go ahead and build 
it from scratch?

We've mainly used Wordpress in the past, but this looks to be beyond its 
capabilities and so far I haven't found anything which has the required 
features (or enough to start with and add in the rest).

Thanks in advance.

-- 
R.Livsey
www.livsey.org