I received instant negative feedback from Pnuk once I installed a Captcha module to prevent unwanted comments. I've been told that nobody uses it anymore and the version I worked wouldn't do the trick anyway since the text was way too easy to read. Sorry about that :)

Little digging around directed me to AntiSpam module for Drupal. It uses Akismet, TypePad Antispam or Defensio anti-spam service to filter potential comment spam. Don't know yet how good is it, but at least it is way more user friendly and I have to agree that the Captcha was a bit yesterdays thing...

Update: Wasn't so good after all. The module worked like charm for an day and after that it started to prevent all comments. At least for now, the captcha is back at feedback form and basic Drupal registration/login feature is turned on for comments. Your registration details are not used for anything, so feel free to create an account in order to comment.

Update #2: Captcha doesn't seem to be a good solution for preventing bot spam. Antispam module is fixed and back on now.