One of the great things about blogging is interacting with others. Every blogger loves to see comments on their posts. How do you encourage people to post? You can ask for comments at the end of each post, you can make it easy to post a comment like we discussed here, you can also add widgets that show the most popular posts. I came across this pluginthat lets you show the visitors that post the most. I just added it at Blogging Painters and decided to run a contest to pick a random comment for a prize.
The plugin is very simple to set up and use!