I visited http://osgrid.org , for a short time, just to see what it looked like. Well, it needs a much better Ruth, it's quite awful.
This visit was inspired by the latest post from Gwyn basically she says the future of 3D worlds is with Linden Labs following the Opensim model. But go read it yourself.
“We are all travelers in the wilderness of this world, and the best we can find in our travels is an honest friend.” – Robert Louis Stevenson