Audit Mode is a very practical way to prepare a system image without any user specific information like usernames or computer name. With it you can create a General System Image that gives you always when used a fresh, clean Windows 7 setup as if it were a virgin, fresh install, only difference being your software, drivers and updates are already installed. Using System Image recovery is a much faster method to start fresh than reinstalling everything.
When recovering image created with this method, computer will start in so called First Run OOBE mode without any user accounts but all drivers, software and updates installed, stopping to ask for initial username, computer name, language (if additional languages installed), time zone...