This plugin gives you users the ability to have their *own* guestbook page. With advanced features, such as markup [optional], smilies, ability to ban users from posting on their Guestbook, logging of postings (for admin's eyes only), the ability for admins to "validate" new submissions [optional], a CAPTCHA system for the add pages [optional], many admin features (such as log viewing, validate new posts)... and more. You can even display the xx most recent entries from their guestbook, on their profile page. Users can also preview their guestbook entry, before posting. For more details, see the "Features" section - as there's a lot of cool features in this plugin.