Heads up:
At Searchdaimon.com we where using the reCAPTCHA extensions. reCAPTCHA most have done some changes on there end recently. It used to work perfectly, but after a user complaint about the captchapas being impossible to solve we did run some test today. Many of the captchas was just a blur, or had part of the word missing:
http://static.searchdaimon.com/images/sd_images/bad_recaptcha_2012.png
Maybe time to start looking around for an alternative.