The best Guestbook you can get, 5 out of 5.

I reviewed earlier but gave it two stars for the effort because the Captcha validation is broken.

Spammers can leave out the 'gbcode' from POST and EB will store the entry as if no captcha was active..

Replace the if-statement on line 209 of
components/com_easybook/models/entry.php to include a check for the 'gbcode' key. E.g. use:

if(!array_key_exists('gbcode', $data) || !$captcha->checkEnteredCode($data['gbcode']))

I've monitored my install for a few days now, and the occasional visiting spammer leaves after one try, so it seems their methods won't work anymore :)

hth