Personal Bridge Scorer is a Palm application that allows you to keep track of your duplicate game results without having to go find a pencil! It's also great for allowing you to leave your convention card on the table, never having to pick it up and turn it over several times a hand.
Personal Bridge Scorer is free to use. If you find it useful, there will soon be a donate link where you can send me money (to pay for bridge entries of course!) Either way send me suggestions -- there are lots of ways to improve this tool.
If you don't have a Palm device, you may be able to buy a cheap Palm/Handspring off of eBay. I suggest getting a model with color (it just looks better) and potentially a rechargeable battery.
There was an iPhone/iPod Touch version ages ago but it is no longer on the Apple Store.