So I'm launching a new PSA.
Visit Sim Neighbours.
Sim Neighbours is a site to look up who you are sharing a server with. You can read more about sims/servers/CPUs in this forum post by Lee Linden.
If your Sim is not in the database, you can get a Registrator-Tron here.
To use Registrator-Tron is very simple. You wear it, and touch to submit your Sim [When you are in your Sim]. That's it, thats all.
As a public service, you can go around registering sims if you happen to be an explorer.
Currently, I have visited ALL the Old Mainland Continent - There is still most of the private islands, as well as the North Continent left to register.
[Sorry if this is in wrong Forum - couldn't really figure out where it would fit]