Talkr

This module creates a link to a specific page at www.talkr.com and provides a very simple interface for updating your account number into the link. It also allows for the link to have permissions attached (so anonymous users - read Google here) don't jam up the works.

It is very simple and since I don't have a Talkr account I have no idea whether it works. I just used the specs someone provided in a forum topic. See http://drupal.org/node/131405 for more information about this project and speak to Jym Brittain for more information about it.