At present there are only two different worlds planned.  Below is a list of information about each world.

Resurrection
These lands were once known as Tyrranth, a province of the Deathless Empire.  Long abandoned, Tyrranth has remained a lawless frontier for centuries.  All contact with the rest of Aerynth was lost at the Turning, and the factions of Tyrranth have battled for dominion ever since.
Mapset: Aerynth
Online Since: TBD
Proposed Siege Windows of Opportunity: From 11 AM to 11 PM Central Time
Mine Windows of Opportunity: From 11 AM to 11 PM Central Time

Test
The Test server is currently closed to all but the SBEmu Team.
Mapset: Varies
Online Since: July 21st, 2009