Digital Elevation Model (DEM) at the global scale, made by the US Geological Survey (USGS). Resolution is approximately 1 km at the equator.

Examples of applications of this data set can be found at
http://edcdaac.usgs.gov/gtopo30/hydro/apps.html

Based on GTOPO30, this datasets are primarily used for hydrological applications. They have been developed to provide comprehensive and consistent global coverage of topographically derived data sets, including streams and drainage basins. Of particular interest is the so-called "correct DEM" that has been processed to fill all spurious sinks, while maintaining sinks that are natural occurrences in the landscape.

These data sets are of value for all users who need to organize, evaluate, or process hydrologic information on a continental scale

More recent than GTOPO30, GLOBE data sets tend to be more accurate, although they have the same resolution than GTOPO30.

First available global DEM providing both topography and bathymetry. Resolution is 5-minute latitude/longitude (roughly 10 km on the equator) on a non-projected grid.

ETOPO2 is the most recent gridded database of bathymetry and land topography covering the entire surface of the earth. Grid cell spacing is 2 arc-minutes (roughly 4 km on the equator)

The software GEODAS is available to extract information from ETOPO2:
http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html

COastline Extractor developed by NOAA
http://rimmer.ngdc.noaa.gov/coast/

Available through the Paleoclimatic Program, National Oceanic and Atmospheric Administration

Data in Excel format

This database service aims at gathering all know geographic localization (cities, places, landscapes elements, etc.), and it is possible to get the  coordinates for any of these objects. It is maintained by the National Imagery and mapping Agency

Another geogrpahic names localization. Although a good ressource, it tends to have less small location names than GEONet

The LGM map is presented in a dedicated webpage with access to its GIS format (shapefiles), and two image formats (tiff, eps). Access to the original online paper is through:
http://intarch.ac.uk/journal/issue11/rayadams_toc.html

The Group QEN (Quaternary Environment Network) has many maps and articles about past vegetation.

This map has also been incorporated into the NOAA website, and it can be seen dynamically with other environmental layer:
http://map.ngdc.noaa.gov/website/paleo/paleoclimate/viewer.htm

A poster of the LGM vegetation for Africa has been presented at the XVth INQUA Congress in South Africa, in August 1999:
http://lgb.unige.ch/~ray/poster/map+.pdf

The present potential (PP) map represents the present vegetation without human impacts. The maps have been produced in collaboration with Jonathan Adams.

These maps have been gathered through a collaboration with Jonathan Adams and are available for 4 key temporal intervals:

Present potential (4'000 BP)
Early Holocene (8'000 BP)
Younger Dryas (11'000 BP)
Last Glacial Maximum (21'000 BP)
 

Paleoclimatology, Max Planck Institute at Jena
http://www.bgc-jena.mpg.de/bgc_prentice/start1.html

NOAA (US National Oceanic and Atmospheric Administration) Paleoclimatology
http://www.ngdc.noaa.gov/paleo/ctl/paleo_data.html

PAGES (PAst Global changES). International Research Group.
http://www.pages.unibe.ch

EPILOG (Environmental Processes of the Ice Age: Land, Ocean and Glaciers)
http://www.images.cnrs-gif.fr/wgroups.html#anchor1542121

IMAGES (International Marine Past Global Changes Study)
http://images.pclab.ifg.uni-kiel.de/start.html