• Connect Google Talk to AIM, MSN, & Yahoo
  BigBlueBall Forums
  Google has announced plans to get Google Talk and AIM talking, but with a little elbow grease you can do that and more today. Now that Google has
  aim amp aol connect discussion gaim google icq instant message messaging messenger msn talk trillian webcam yahoo
  in Public bookmarks with google im jabber msn yahoo by 3 users
• im meebo.com
  
  Meebo, the web platform for IM on any network or site. Meebo connects you to MSN, Yahoo, AOL/AIM, MySpace, Facebook, Google Talk, and many more!
  aim express facebook google instant live messenger msn myspace talk web windows yahoo
  in Public bookmarks with ajax gtalk im messenger msn yahoo
• Psi Jabber Client
  A nice multi-platform jabber client.
  in Public bookmarks with im jabber messenger open-source

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