I'm a bit surprised this global DEM of the Earth released roughly 2 weeks ago hasn't been discussed here yet. The horizontal resolution is 30 m and the vertical accuracy 20 m, both at 95% confidence.
The procedure for downloading data is described at http://asterweb.jpl.nasa.gov/gdem-wist.asp
I downloaded a single 1x1° tile (there are more than 20,000 1x1° tiles) - it is provided as a 3601x3601 pixel GeoTIFF file. This thing looks very promising. A quick-and-dirty test rendering:
Click to view attachment
This rendering has a 35° field of view, the altitude is 22 km and the mountains typically are about 700-1200 m high. I don't have a suitable texture map to drape over this particular part of the DEM but I didn't want it in this case anyway as I made this rendering to check the DEM's quality. This is a far better (in terms of resolution) rendering than I have have ever before been able to make from publicly available DEM data, at least for this part of our planet.
Now all I need to do is find suitable satellite images to use as a texture map and to download some additional DEM tiles...