How do you manage your geospatial data? I have terrabytes of data spread out over hundreds of datasets, and have an ad-hoc solution using symbolic links within projects which link back to an domain-name based archive directory for each dataset. This works mostly, but has its own issues.

I'm also keen to hear if anyone manages their geospatial data in a revision control system; I currently use one for my code and small datasets, but not for full datasets.