Some comments and updates on the digital colophon post:
Dave Smith suggests:
As long as you’re buying pens at Mai Do, try the Zebra Sarasa. It comes in 0.4mm, and writes very smoothly.
Don Hosek recommends the Carbonized Emacs for OS X.
Brad Choate published his list of OS X apps.
Jenni Tauber recommends Devon Technologies’ Word Service.
