Kim planned two weeks for this but unfortunately I only discovered it a couple of days ago. Therefore I don't think I can really write about what new techniques I used for making my blog more comment-able.
Every blogger wants to see comments on their posts. It shows that their blog is being read, that they have connected with their audience and comments give vital feedback on their content. I have learned a lot from comments on my blog and I love catching up with my other blogger friends through their comments.
I have found that the blog posts I get most comments on are
1. Highly interactive, such as the Friday Challenge.
2. Have something to say or solid content and, while perhaps posing a question, don't just exist to pose a question.
3. Have caused a debate, either on the post itself or in reaction to comments left on the post.
For a really good list of other reasons people comment, check out Shadowthorne's response to my earlier post on this topic.
When it comes down to it, what prompts me to comment on someone else's blog? I guess first and foremost it is content. If the post has something to say, and is said in an interesting manner I want to add my two cents worth.