Articles
Turn WordPress into Multisite
Starting in WordPress 3.0 WordPressMU and WordPress have merged, this page on the codex explains how to enable your installation for Multisites
WordPress Multi Site .htaccess file for sub-directory
WordPress Multi Site .htaccess file for sub-directory
How To Configure WordPress 3 to use Subdomains in Plesk
How To Configure WordPress 3 to use Subdomains in Plesk
