Post authors are notified of new comments by default; there are several plugins that modify this behavior. See wp_notify_postauthor.
You can hook into comment_notification_recipients and add an aribtrary list of recipients as described here. Then you could create a metabox or dashboard widget to manage the recipient list.
Keep in mind that this functionality might be abused as a spam engine or turned into one unintentionally if your comment spam filtering is inadequate.
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