I hate Captcha.
I assumed that because I had all my settings set to 'let anything in' in the new blogger interface I was covered. I have also commented on my own blog and never had an issue (well duh! I'm the author).
Turns out that using the new interface there is NO way to eliminate the evils of capture, you have to turn the old blogger interface on, go to Settings, then go to Comments and scroll down to disable word verification.
I've talked about how much I dislike Captcha in the forums, I can't believe non of you told me I was using it!!!!
Thanks to Onika for doing so :-P
Anyway, apologies to all. I never intended to make your lives more difficult than they needed to be.
Captcha is Evil.