Update on HDF, including recent changes to the software, upcoming releases, collaborations, future plans. Will include an overview of the upcoming HDF5 1.8 release, and updates on the netCDF4/HDF5 merge, HDF5 support for indexing, BioHDF, the HDF5-Storage Resource Broker project, the NPOESS BAA, HDF5-OPeNDAP project, HDF-EOS library and website supports and the HDF spin-off THG.