2D Graphics - Techniques

PhotoShop

URL Description
Blue Lightning TV
How To Create a Pencil Drawing From a Photo In Photoshop - Line Drawing Effect

A very good tutorial that includes several filters together to create a pencil drawing from a Photo: Gaussian Blur, Glowing Edges and Charcoal filters.

How To Make Your Own Pic Into Cartoon
How to Cartoon Yourself in Photoshop CS5
How to Make a COMIC BOOK effect
How to Make a Comic Book, Pop Art, Cartoon from a Photo
How to Transform PHOTOS into Gorgeous, Pencil DRAWINGS

Possibly the simplest approach to make a pencil drawing from any photo

How to Transform PHOTOS into Gorgeous, Pencil DRAWINGS 2
How to Use Photoshop Actions
Make a Marble Sculpture Bust from a Photo
Photoshop Tutorial: Repeating Texture
Photoshop action to create an outer space scene
Transform Yourself into an Animal!
Transform a Photo into a Brick Wall Portrait