I do my best not to be the one stuck emptying the dishwasher, but when I do end up with the job I hate the puddles that form on the bum of bowls and mugs. I usually use a dishtowel to mop up trapped water before removing the cups/mugs/bowls. I make a majority of my pieces flat on the bottom so they don't need to be trimmed but occasionally one has to use a foot. I don't remember where I saw it, but some ingenious potter put a few small notches in the foot ring to let the water drain out. I might see if I can incorporate a notch or two with a signature, two birds; one stone sort of thing. Anyone else cooked up a good solution to trapped water?