The last few days I have been trying out all the new grids that are out there in cyberspace.
They are not as many functions implemented yet but there are many new grids operating now some of them even
Commercially. Many of the fancy stuff on the Linden grid do not work but you can build and script or just explore. Some say that it is all these new grids that a pushing land prices on the Second life grid down.
When you can start your own server and connect it to one off these grids, well do you need Second life?
Here are a few links to get you started.