Here are some Matlab demos for the MSRI Inverse problems graduate workshop July 20 - 31 2009, that show resistor network methods for a spectral problem and the EIT problem on a disk. The latest version of the demos is available here: msri_r1359.tar.gz.
Please see the included README files and/or for more information and references.
Contact information: fguevara (AT) math (DOT) utah (DOT) edu