I was tired of the Busby SEO comments. They just posting comments to increase the page rank in search engine. The comments are just something related to the headding, they are not reading the entire post. I was happy to find the new extension for BlogEngine Commenter by Ruslan. which is a great extension, but i saw another extension by Chris - Blacklist Extension for Author Names. which does the exact things which i wanted.
Do if you are tired of a specific named spammer you can use the Chris extension. Otherwise use the extension by Ruslan which will help you to block spam comments.
Hope that Google will blacklist this Busby SEO soon.