The main reason I did this is for accessibility. Since LylaCaptcha is not accessible to blind, low vision, and possible color-blind users, I do not feel it is an acceptable solution.
At first I was going to put in reCaptcha, but I tried it out, and the audio CAPTCHA was hard to hear. Then I saw Dan Wilson's post about CFFormProtect, so I thought I would give it a try. I will report my results in a few weeks.
Please let me know if you have any trouble with leaving comments on the blog. Hopefully this will make commenting easier.