I have 6 stripped spoke nipples on my rear wheel. Last night I took the tire off, took the, for lack of a better word, rim strip off, and started to try to unscrew the nipple from the rim. Before I knew it I did more damage then good. Is there a special tool to remove spoke nipples that I am not seeing? What is the best tool for removing it if I can't get a screwdriver to work? I tried dropping some grease inside to help me take it out, but that did little if anything.
You need a spoke key of the correct size. See Which size spoke tool. Currently size 14 for some discussion - the short version is either visit your LBS and buy the size that fits your spokes, or just buy the three most common sizes.
Using a screwdriver is unlikely to work - wheelbuilders use them in the very early stages when the spokes are very loose, but as soon as a little tension goes onto the spoke the nipples are impossible to turn that way.
Edit: a couple of links on how to true wheels. If you're willing to spend money The Bicycle Wheel is pretty definitive and it's quite a short book. It's hugely better than anything I've seen on the internet.
And your LBS should have a pile of spare nipples for their wheelbuilder(s) to use. They're only a few cents each, but buying retail like this probably 10c-20c is more likely.