Free, Lightweight, standards compliant, multi-lingual (pl, en), almost-one-file guestbook script using flat-files to store entries. It has an admin mode (password: test!@#) that lets you moderate (delete or approve) selected entries. It is also fully configurable (you can even make your own html template for the entries) and has captcha protection. Since the path to the guestbook file can be set dynamically, this script may also serve as a comments module. Did I mention it's 100% free for personal or commercial use? All I ask is that you link to this page if you decide to use it (no obligation though!).