NASA GLAS Lidar Data can be downloaded here.
I cannot find (or perhaps understand) the answer to my question on the icesat/glas page. Lidar data can be provided as points (las) or raster (dem), though I believe either could be packaged as HDF5 (what they offer). They list a number of parameters which makes it sound like it's points, but then they compare results with an SRTM dem.
Does anybody know what you get with this download?