A new operating system based on Ubuntu 7.10 and Enlightenment 17 has come out. One of my friends has downloaded it and installed on a VPC. (But still it seems some problems) Anyway it seems nice and looks like an Apple machine. They provide some basic day to day facilities on that. And it supports Google a lot and Wikipedia also.
Here the article on wiki about it. http://en.wikipedia.org/wiki/GOS_(Linux_distribution)
And also you can download its free on http://www.thinkgos.com
Still it does not provide some advance stuff like development tools but I hope sooner they'll. (Currently they have what home users use most)
And also there is an operating system as Goobuntu which Google uses internally. If you interested on Goobuntu then go to http://en.wikipedia.org/wiki/Goobuntu