SiPix is a bistable electrophoretic display just as e-ink is BUT it uses a different process and a "microcup" design to house the pixels. There has been no way to compare robustness since there hasnt been a product shipped yet. Glass substrate so its probably about the same.
Touch is capacitive. No one in the media has really played with one yet except for at cebit
charbax at cebit
http://www.youtube.com/watch?v=-AAas61WyGA
engadget (got the touchscreen wrong)
http://www.viddler.com/explore/engadget/videos/1150/
http://www.youtube.com/watch?v=4mi0B...eature=related