Time Wasting Blog Comments, Comments Policies, and Comment Etiquette : The Blog Herald
Useful article on policies around commenting on blogs and encouraging people to leave a comment. My suggestion is to leave the end of the post with a provocative statement or a question that has relevance to the reader, and encouraging people to respond in the comments area.
Another method that I’m trialling is to start an introductory comment in the comments section that asks a follow up question to the post.