Yesterday I tried using Google Talk to do a voice chat with a friend in US (Ann Arbor, Michigan). I am spell bound and awe-stuck by the voice clarity. There is very little unnoticeable lag and the clarity is much more superior than I expected. Evidently Google has added another feather to its rich haul hat.
Google Talk is based on open source jabber (XMPP) spec. The interesting point to note is that the spec has been available since 1999 and google has implemented it to get it noticed.
Also the first line in the Google talk page is interesting.
"They say talk is cheap. Google thinks it should be free."