Here is a chart showing the variation of contact resistance of several touch sensors while pressing button very progressively. 
- There are huge differences between various sensor
- Lightly pressed touch sensors have contact resistance in the 2 to 5 KOhms range.
- Fully depressed resistance varies (for the samples I measured) between 400 and 560 Ohms

More details on touch sensors resistances can be found in this Lugnet thread: http://news.lugnet.com/robotics/rcx/?n=2191


Philo
www.philohome.com