Seeking good IM/chat modules
There is a Drupal Chat module for chat. It uses node.js and hence highly scalable


  
  Supports smileys (detects them automatically in chat messages) 
  Chat history is retained in between page loads
  Provides option to use Normal AJAX, long polling and Node.js (only in 7.x) techniques to update chat messages 
  Provides optional integration with User Relationships module.