Here's a multiplayer tutorial:
Multiplayer - Extensive Tutorial This tutorial explains more in-depth how the native Multiplayer of 3DGS works and some tips and tricks for traffic optimization.
I'm writing this as I develop this MP system for my next project. It is meant to serve as a core for MP projects and be flexible to extend further for any kind of project.
I intend to continue adding to it, to modify it for FPS and Isometric point and click (Diablo-style) and probably MMO systems.
I just finished a round-based respawning system (Counter-Strike-like) (request by a forum user) and I'll add it soon.
My next planned feature is servers list.
I hope I'll have more time to develop this. Its crazy around me.
And I hope it will help at least one person to make a MP game with 3DGS. We need more of those!
Happy reading!
PS.: If you have any suggestions of feature requests, post them here or under the tutorial text on my page. I'd be happy to help if I have the time to implement them.
EDIT* Should I also post this in the Multiplayer section? Or anywhere else?