Use VMWare or Microsoft Virtualization software to emulate a server on your desktop/laptop, dedicated for developing WordPress/WPMU/bbPress themes and plugins. Easily test your themes or plugins across different versions.
1. Latest versions (WordPress 2.1.1, WPMU 1.1.1, bbPress 0.8.1) pre-installed
2. Easy to update subversion nightly available.(simply run 'svn update' in the SVN folders)
3. Local testing. FTP/SFTP/SSH access provided. Nothing to worry about. Easy to recover from errors.
4. Newbie friendly, all Web-based administration, backup/restore features, server configuration, reboots, and updates.
For screenshots, download and quick guide, please visit http://en.72pines.org/the-ultimate-wordpress-mu-development-appliance/
Comments/feedbacks/feature requests are all welcome.