If you want to avoid unsightly calluses that develop on your fingers from too much pen action, take note of the “RingPen.” Judging by the design of the pen, I’d say as a lefty I’m pretty much shafted, but right-handed users looking for alternative pen options ought to take a gander. I get the feeling from the “center of gravity” description the site gives that this is like trying to write with chopsticks, which may in fact turn it to be more ergonomic than traditional penning methods.
Official Site [Ringpen via ShinyShiny]