Now to answer a quick Blogger question that Anna raised. I highly recommend that you set your blog up so that your comments come into your email. Do that by going to your SETTINGS, then choose the Comments folder. At the bottom of that page there is a space for Comment Notification Email. Add your email address there.
Your email address won't appear anywhere on your blog by putting it there. It just means that you will receive every comment posted on your blog in your email. Then it's a very simple matter to reply to comments at least from fellow Bloggers or those who've set up a Blogger profile.
Unless they're no-reply. If Bloggers want their email addy to show up, then they need to go into their profile and add it. That's the best way to interact.