NOAA/ESRL/PSD Catalog http://www.esrl.noaa.gov/psd/thredds/catalog/Datasets/ncep.reanalysis/catalog.html

Dataset Size Last Modified
     Folder  ncep.reanalysis   --
         Folder  other_gauss/   --
         Folder  pressure/   --
         Folder  spectral/   --
         Folder  surface/   --
         Folder  surface_gauss/   --
         Folder  tropopause/   --

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