I use a touchpad GPS regularly at work and lost the pen stylus a long time ago; it was inconvenient anyway trying to hold the stylus, GPS unit, and drive an ATV at the same time. So I made some finger stylussss?Stylii? from old water jug handles for work. For this Instructable I added some extra parts for fun Steampunk styling.
*update: This was used for pressure responsive touch screens like a Nintendo DS; to make this work for capacitive screens I would suggest adding a conductive coating like copper foil tape.