I was not sure whether I should add a guestbook to the site. Of course I would be very happy if visitors left their comments or questions, at the same time I know how often I left an entry in another guestbooks (very rarely). I decided to give it a try and use it to announce updates as well.
I have not found out yet, how I can edit the headers, but I am confident that non-german visitors will guess that "Neuer Eintrag" means "new entry". If you don't - well that's what it means. It's an invitation to tell me what you think.
Testing this guestbook myself, I noticed that it is required to give an e-mail address. I strongly suggest using a fake e-mail, protect yourself from spam!