This plugin allows you to have multiple blogs running off one WordPress install which can share content, have different titles, descriptions and theme
The Super Category plugin allows you to have multiple websites running off of one install and one database (one set of tables). The websites can share content if you wish it, and can have different titles, descriptions and themes. This plugin is a true plugin: there are NO HACKS and NO THEME EDITS of any kind. The plugin works with any other plugins and themes that use WordPress’ built in APIs, and features modular functions that can even make other plugins that use custom queries work also. However, this plugin is not for the novice user.
This plugin is Officially unsupported. It is only a proof-of-concept.
Use at your own risk.