HyperBook is an easy to install and use guestbook written in PHP. Features: multi-file "flat text" database for fast access without SQL; customizable colors and graphics; option to add additional questions; e-mail notifications with link to edit, delete or add comments to posts; double post protection; configurable IP log to prevent message flooding; forced word breaks to ensure proper formatting; optional banned words filter; version update check; and import/export databases. Comes with complete documentation. Update: Version 1.10 includes foreign language support and improved file locking.