Mini-tutorial: Blend modes and light textures: PS

I made a small guide for using light textures and how to achieve certain effects when using blend modes. It was made using Photoshop CS but it should translate to some older versions as well. I'm not sure how applicable this is to PSP users.

Any comments or questions are welcome. This is very basic, and it's also the first type of tutorial I've tried creating for others. Hopefully it's useful and easy to understand.

( Here. )