There's a very interesting Workflow plugin for Movable Type. The gist is that it lets one author create/edit an entry, and then pass that entry off to another for eventual posting. (No, I didn't say it was a complicated plugin.)
How could this be useful?
Well, take for example, the ITS News site. Say any person in ITS could create a write-up to be released/posted. After write-up creation, the original person transfers ownership to our Communications Officer. Then, the Communications Officer can clean it up (if it needs cleaning) and post it (or not post it).
That same functionality can be extended to any "Announcements" style blog: PeopleSoft, for example.