MultiUserWeblogComparison

Massively Multiuser Weblog Packages
There has been some work on comparing the "single user" weblog packages, but nothing really describing the pros and cons of the weblog packages in terms of a large-scale deployment. Things like enterprise-level blogging, or University or Institutional blogging, with hundreds or thousands of users.

There is a highly detailed overview of about a bajillion CMS packages here.

Here's a nice table comparing the Known Multiuser Weblog Packages: