Resolved - patent examiner independently struck down claims - see comment below.
Does anybody know of any prior art related to US20110128257 ?
The patent US20110128257 claims a provisional application date of Nov 29 2009.
It seems that there is prior art at least for claims 1 and 2:
Collins, Ryan V. Methods and apparatus for receiving user input via time domain reflectometry. US-Patent 2004/0239616 A1
Furthermore, the general principle of touch sensing using TDR has already been described in 1964:
Edit: According to the Public PAIR, the patent examiner struck down claims 1-5 as being already described by Kozik et al. (US 5149918). The patent only refers to optical TDR now.