Pen Fetish Friday submissions can only be mass-produced pens, preferably available in office supply stores at the very least. Preferred pens and mechanical pencils in the Comments, thank you.
The Sharpie(R) Retractable Ultra Fine Permanent Marker is currently the weapon of choice. Was at first annoyed when Filthy Assistant (yay, I have a Filthy Assistant!) picked up a box of the wrong kind of Sharpies, and know I carry fistfuls. Clean, thin line but Sharpie-black -- perfect clarity, jumps off the page.
Alternate fancy-pants everyday pen -- the Waterman Harmonie fountain pen. Once you go fountain pen, you never go back.