Posts Pinger for Kunena plugin can add extra ping-feature to Kunena forum and can ping update services (that can be specified manually) whenever a user creates or even edits a new topic or post. The functionality is identical as in Wordpress.
Sending a XML-RPC ping to popular Update Services let immediately inform other users about content updates on your website via selected services. This technology is very popular on Wordpress platform since it helps with indexing the content and can increase traffic and attract more attention to the website since people who are surfing on services like Technorati or Sphere will see your recent updates there.
Now this plugin ping Update Services about new or edited Kunena topics or posts.