One word of warning about comments on blogs.. We have found it better to either make them work flowed or make then authorised only. The issue here is with spammers. You could integrate Captcha.
This looks good although I have not used it http://ez.no/community/contribs/workflow/peter_s_custom_anti_spam_image
Good luck and let me know how you get on.
Tony
Tony Wood : twitter.com/tonywood
Vision with Technology
Experts in eZ Publish consulting & development
