What is the best site to see current satellite photos of the poles to see changes in the ice?

Question

I would like to be able to go back several years and compare photos.

Answer 1

Ice and Sea ice maps through time- (with links or information on primary sources-satellite info):

http://iup.physik.uni-bremen.de:8084/amsr/amsre.html
http://nsidc.org/sotc/sea_ice.html
http://nsidc.org/data/smmr_ssmi_ancillary/area_extent.html
http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16689
http://www.gsfc.nasa.gov/topstory/20011001icepuzzle.html
http://weatheroffice.ec.gc.ca/satellite/index_e.html
http://www.arctic.noaa.gov/data.html