We would like to let you know about a new hypergrid website/directory we are making called OpenSimWorld . Our directory lists the registered regions that are active as well as the number of avatars on each region. You can add your own region by rezzing our beacon object to your region. The region listings are available on the website and are also accessible from inworld through our HUD. It's a concept similar to the hypergates, but additionaly you can find out which regions have visitors and access them instantly anytime through the HUD.
We are currently looking to add more regions to test our system.
If you are interested, head to http://opensimworld.com/
for instructions on how to add your region.