Real dice. Physical polyhedrons. Roll them bones.
Yeah, while not as much of a dice-o-phile as some friends of mine are, or as I used to be, I prefer to roll honest-to-goodness plastic objects whenever possible.
It's funny to me too because I have a very strong preference for D6s, the most mundane of the various die types we gamers use. I dislike the D20 for a variety of reasons, chief among them the fact that they seem to dislike me. My luck with D20s is bad to the point of diminishing all the studies ever done on how probability is supposed to work mathematically.
I do use Dicestream pretty often these days for my online games, but if given the choice I prefer to kick it old school.
One down, thirty to go.