There is a data provenance and versioning task team for the databank effort - details are available from http://www.surfacetemperatures.org/databank/provenance-and-version-control-task-team. This task team has now met twice by telephone and made some initial inroads into the problem.
More generally the main surfacetemperatures.org site continues to be updated with progress as it happens. Other commitments have meant many of these have been left not noted here. My apologies.