Gwolle-GB is the WordPress guestbook you've just been looking for. Beautiful and easy.
The following list contains things I'd like to include in future releases. If you have a feature request please use the forum on WordPress.org; I'll may add it to the list then.
Have something to add here? Please add a new thread in the WP.org forums and tag it with "Gwolle-GB". I subscribed to that forums, so I'll get your message. Or, if you're in a hurry, send me an email: gwolle (at) wolfgangtimme (dot) de. Thanks!
I'm currently looking for people willing to test new releases of the plugin before I release it to the public. Due the fact that I've got only two sites to test the plugin with I need some people who test the plugin on their site. If you wanted to participate please let me know. Write me an email or add a comment to the plugin's homepage. Thanks in advance!
The plugin itself (the "code") is released under the GNU General Public License; a copy of this licence can be found at the licence' homepage or in the gwolle-gb.php file at the top.
For the licences regarding the Askimet classes, the use of reCAPTCHA or the icons you may ask the authors.