A pair of SlideWide sensors (http://infusionsystems.com) are stuck to each other at right angles.

Instead of measuring single touch position for each axis using the well-known potential divider method I modified the pads and wire them to ground the “wiper” contact and measure the two end point resistances to this ground node to estimate the position of the outer most touch point pair. This example also includes a sheet of piezoresistive fabric to measure a single pressure estimate. The SlideWide sensors flex sufficiently for a useful touch pressure range.

This duo pad was part of our public demonstration at Maker Faire 2007: