Arduino and AD7746 (I2C)

hey everybody, I know this has been on the forum before. but as other people before me I have some troubles getting arduino and the AD7746 from sparkfun to work (capacitive touch senor)

the only thing I need to do is to read whether it recieves a 'touch' or not. I've tried to get through the example c project on the sparkfun site as well as the excellent post about the the I2C expansion I/O. but I have no clue how to transform that to work with this device. Does anybody has experiences with the specific sensor or can point me to other important resource?

I would greatly appreciate! thanks, stephan