There was a request by Nicholas Yue for some sample time-varying (gridded) 3d data sets. Here is one that might be useful from the DX bonuspak:
http://www.research.ibm.com/dx/bonuspak/applications/meteorology/data/tropo_temp.dx http://www.research.ibm.com/dx/bonuspak/applications/meteorology/data/tropo_temp.bin http://www.research.ibm.com/dx/bonuspak/applications/meteorology/data/tropo_wind.dx http://www.research.ibm.com/dx/bonuspak/applications/meteorology/data/tropo_wind.bin
