Here are some useful tutorials.

Colored Server Names

Add some colour to the server list.

Delaggify Your Server

Pretty self-explaining, eh?

Infinite Movers

Veeery useful.

LaserTag Minigame

You need to read this tutorial and do as it says in order to make the LaserTag minigame work.

OSX Menus

Cool menus.

Team Spawns

Pretty self-explaining, eh?