Tutorials
SinEd Tutorials:

NOTE:

The tutorials below are abundantly illustrated and although I made every effort to keep the image sizes small, this was not possible in all cases without affecting graphic quality in some cases. Thus, some of them may take a while to load so please be patient.

SinEd user guide:
This is a reference document which lists ALL the key-mouse combinations and keyboard shortcuts for all the functions in SinEd. It also contains information on how to modify your project file to customize the key assignments in the editor. It's basically like the SinEd help file (the one that comes with the toolset) on steroids.
Rating: All levels

Basic room:
This is a step-by-step beginner's tutorial for SinEd. It demonstrates how to make a basic room and use SinEd's essential features. There's also some cool "power" pointers in there so even advanced users can also benefit from it.
Rating: Beginner

Doors:
This is a tutorial by BlindTypist that shows you how to make doors in SiN. It features clear step-by-step instructions and high quality graphics that make it easy to understand how doors work in Sin. It also includes information on how to set sounds, messages and security card access for your doors. Very thorough. A must read.
Rating: Beginner

How to make elevators in Sin:
A step-by-step tutorial by Chronos with a an example script by Tatuone that will show you how to make a basic Quake func_plat style elevator platform. It covers the basic script commands necessary to make a platform with a func_scriptobject.
Rating: Beginner

Brush clipping in SinEd:
This is the first SinEd tutorial I wrote. If you want to learn how brush clipping (and 3-point clipping in particular) really works, this tut's for you!
Rating: Intermediate to advanced

How to make consoles in Sin:
This is a step-by-step tutorial in which you make an in-game interactive console. It covers all the essential aspects of consoles from basic to advanced with detailed explanations at each step of the way.
Rating: Intermediate to advanced