I came across the wonderful pen sketches of Andrea Joseph via her little review set on PenAddict. She is a prolific artist using common pens of all types to create a vast array of images from doodle-like conglomerations to full renderings. She has a real talent for making a simple ballpoint pen work wonders on a piece of paper.
Here are a few images from her blog and Flickr account:
[Andrea Joseph pen sketches via her blog and flickr]
I seem to mostly sketch with pencil, I should do more with ink. Oh and the Pen Type-A looks nice as well...