Been using http://www.captcha.fr/ for a long time, works like a charm. This one seems like it has the extra benefit of sound which atleast someone will love!

I know people keep mentioning that captchas are broken, they are easily cracked with several tools. In my opinion, unless you have a very popular service a simple captcha is all you need to keep those nasty bots away. It works for me!

Should bots get through, all I need to do is really change the font…

Hi,

Nice information, I would also suggest http://www.captchagenie.com , they have a great customizable captcha and the price is not high