Yahoo! Messenger and MSN (******s Live) Messenger users can chat with each other easily without changing clients. Similarly, Google is working with AOL to allow users of Google Talk connect with their AIM buddies.Now consider a completely different scenario - how do Google Talk users talk to their friends who are using ******s Live or Yahoo! Messenger ? Here’s a a possible solution to make voice-over IP calls between Google Talk, MSN/Live Messenger and Yahoo! Messenger for free. 1. If you are on Google Talk and want to voice chat with someone on Yahoo!, add firstname.lastname@example.org as your Gtalk friend and then send the following message to your new buddy: CALL email@example.com [use your friends Yahoo! ID instead of xyz] 2. If you are on Yahoo! Messenger and want to connect with a Google Talk user, add firstname.lastname@example.org to your Yahoo! buddy list and send the following message: CALL email@example.com [use your friends Google Talk ID instead of xyz] For more details visit GTalk2VoIP and their blog.