Our group of companies has recently been involved in parallelizing geophysical inversion codes to work on Beowulf clusters. The project has been quite successful and we are looking at parallelizing parts of other core applications. We make our inversion engine accessible through ssh, and clients run inversions from remote sites around the world. Perhaps other list members have seen DiscWorld and similar geographic applications that support distributed (or grid) computing. I would be very interested in hearing from other developers on the list who have an interest in parallel or distributed grass.
Regards,
John Harrop
SJ Geophysics Ltd