I know several of you are using a stylus on different devices. I use one for my iPad fairly often but am sometimes let down when sketching.
However, there is a stylus made by Dagi that I just got from eBay. It has a small plastic circle on the tip that allows for much greater precision when drawing.
For day-to-day use the rubber tipped, generic stylus is better but for drawing and/or precise writing check out the Dagi. Takes a little to get used to, but worth it.