They've launched it. IM and voice chat via the googlenet and your gmail account.
Currently they only have a Windows client available, but as the system runs on Jabber (open standards++) you can use any Jabber enabled client to connect. Adium is my first choice (the best IM client on the Mac full stop) but Google have instructions available for other clients.
In honor of the first manned Moon landing, which took place on July 20, 1969, we’ve added some NASA imagery to the Google Maps interface to help you pay your own visit to our celestial neighbor. Happy lunar surfing.
And if you zoom right in on moon.google.com, you can see what the moon is really made of.
More moon goodness at NASA.
[Hat tip: emkay]