Made a small Arduino and Processing sketch to display data from an older analog 3-axis accelerometer: the MMA7260Q by Freescale (a spin off company from Motorola). You can download the code here. I tried to keep it as simple as possible.
I’ve wired the accelerometer up to handle 4g, which seems alright for faster hand gestures too. It can be maxed out by very quick hand movement and slapping, though.