The new website improves over the old one in pretty much every way and the guestbook is part of that. The guestbook is more straight forward and more simple to use.
1. You now login using your email address (no need to remember a specific username)
2. You can create new posts at the bottom of the guestbook page
3. You can create replies to all posts at the bottom of the post page
4. You can subscribe to posts with a checkbox to receive emails when someone replies to your post