Arctic Monitoring and Assessment Programme (AMAP): maps, environmental assessments, and many references and links to Arctic resources.
Arctic Transitions in the Land Atmosphere System (ATLAS) data at the Joint Office for Science Support Other information
Global Change Master Directory: A directory of Earth science data.
Journal of Geocryology: full text of articles in native language with English summaries. Also includes several maps and many links to geocryological resources.
UNEP.Net Arctic Portal: A directory of Arctic data, maps, publications, and other information.
See other Frozen Ground related information in NSIDC's "Coldlinks"