I just installed Google Talk (talk.google.com). Its REALLY cool.
It’s a basic IM and its in Beta but the Voice has a really good quality.
I really liked the fact that they use an open standard, the Jabber/XMPP (www.xmpp.org) which is always good. This means that you can use any Jabber/XMPP supported client like iChat (for MacOS), GAIM (For Windows and Linux), etc.
Read their developer manifesto here, to see that they mean business and I do hope that they will use the built-in federation ability of the Jabber/XMPP protocol to federate messages to other IMs such as Yahoo, AIM/ICQ and MSN.
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