NOAA/ESRL/PSD Catalog http://esrl.noaa.gov/psd/thredds/catalog/Datasets/cmap/std/catalog.html

Dataset Size Last Modified
     Folder  std   --
         precip.mon.ltm.nc 750.1 Kbytes 2012-09-25T17:04:53Z
         precip.mon.mean.nc 16.38 Mbytes 2013-04-10T19:19:29Z
         precip.pentad.mean.nc 99.63 Mbytes 2013-04-10T19:20:22Z

NOAA/ESRL/PSD at NOAA ESRL PSD see Info
THREDDS Data Server [Version 4.3.15 - 20121218.1126] Documentation