What tools do you use to sketch?

I wrote an article a few weeks ago for the Adaptive Path newsletter about the tools I use for design-related sketching.

My sketching toolkit

Imagine my delight to see other people now sharing their favorite sketching tools. Some cool additions to the toolkit:

Manga pens (from Jackson Fox)

11x17 graph paper (from Beck Tench)

Exacto knife qua pencil sharpener (from Michael Angeles)

Beck Tench also has a tip I love, which is:

"The first thing I do in a sketchbook is go through each page and number it w/ a soft pencil.  This helps me reference and later find a specific sketch and also gives me a nice sense of progression as I sketch my way through a book."

So, what do you use? Tell, oh tell!