Multiply is a plugin for WordPress 1.5.x which allows multiple blogs from within the one administration interface. Includes one-click creation of new
This plugin allows you to have multiple blogs running off one WordPress install which can share content, have different titles, descriptions and theme
Partition your blog into several sub-blogs using categories. This allows for supplying a unified blog in addition to "specialized" sub-blogs.
Moderate comments for multiple blogs on one screen no fancy screen, just what you're acusomted to.