WordPress is a system we have been using a lot , since years back. Today, for the first time, we release a plugin to the WordPress plugin directory.
The plugin, with the name EP Comments Export, lets you easily export all comments and comment meta data from a specific post, page or custom post type. The export will be saved as a .csv file for you to download. To download the .csv file, just click the new icon added in the all posts/page list.
Today you can only export comments. There are plans on making it possible to import an exported .csv file to a post.
You find more information and the plugin at wordpress.org plugin directory.