Another thing to do is thank people when they’ve commented on your weblog. Not every time, because that get’s annoying, but doing it the first time is a very good idea.
Justin Shattuck thought the same, and created the Comment Relish plugin which sends an email after someone has made his first comment, unfortunately, this plugin is no longer maintained. Another option, which is maintained and is also a bit less obtrusive / spammy, is to install our comment redirect plugin. This plugin allows you to redirect people who have made their first comment to a specific “thank you” page.