Captcha - I didn't wanted it

Hi,

I really don't like captchas but unfortunately since I moved my site from my homeserver to this machine the well known and hated „scripting-kids“ have filled my comments with scum as you may have seen.
Some days ago I've cleaned up this mess and I needed 2 hours.

That is the reason why I've now installed captchas for commenting.
But because I hate them because often you really can't read the letters I've enabled the voice captchas which means there is a little link to download an audio file which reads the needed letters using the NATO alphabetic.

I hope you can live with it and it prevents these junkies who think they are cool if they spam sites with their shit.

Please tell me if you have a proove that they are liquidated. Then I'll definitly remove the captchas.
Also I'm looking for other possibilities to guard my sites against them.
So leave a comment here if you know something useful.