Hi all,
I have looked around on the internet and found some interesting layers to display in Google Earth. I have listed them below. If you find some more interesting layers, please add them to this thread.

NSIDC-IPA Permafrost and Ground ice map
http://nsidc.org/data/virtual_globes/noaa/NSIDC_cryosphere.kml

Climate Change: Google monitors Permafrost Melting:
http://bbs.keyhole.com/ubb/download.php?Number=722766
The related web entry: http://www.geostrategis.com/p_mapm2.html

Permafrost Melting north of Lake Winnipeg:
http://bbs.keyhole.com/ubb/showflat.php?Number=973498

Permafrost melting: Retrogressive thaw slump in the Yukon
http://bbs.keyhole.com/ubb/download.php?Number=1116622
Forum entry: http://bbs.keyhole.com/ubb/showflat.php?Number=1116622

Methane Hydrate hot spots:
http://bbs.keyhole.com/ubb/download.php?Number=1178979

Permafrost and glaciers from Alaska (virtual trip):
http://bbs.keyhole.com/ubb/download.php?Number=1228514

Permafrost Lake Bank failure
http://bbs.keyhole.com/ubb/download.php?Number=1000232

Enjoy! Hugues