Chris Garrett writes a post on 10 tips on attracting more comments on your blog. My favorite are no. 5 and 6.
# Hint – Open questions are the best to get great quality answers, ie. “What do you think?”, but they can be intimidating. If you struggle to get comments it might be easier to give simple leading ideas for what people should say, eg. “Do you agree?”, “Are you for or against?”. “Yes, no, me too” are not great responses but at least they are a sign of life!
# Restraint – Resist the urge to make your posts too complete if you want to receive community input. That’s one of the great things about top ten lists, you have to stop at 10! Don’t put everything into the post, especially if you know your audience has certain expertise they are bursting to share!