Learn more about the
hobby of polar philately, and the organized group of
collectors
called the American Society of Polar Philatelists, and other
related links at www.south-pole.com/homepage.html This is Gary Pierson's page, and quite probably the single best
Antarctic philately page on the net;
superbly done. 
Find more information about Antarctica in the New South Polar Times.
Visit the website of the American Polar Society.
Steve McLachlan's Antarctic Philately page. A delight! Great illustrations of covers, and very much a page where new collectors (or wannabes) can learn about this hobby, as well as see photos of some of the vessels we get covers from. Steve is also a stamp dealer, so you can actually buy some of the covers he has illustrated.
Polar covers and polar items as well as a web-shop
from Matthias Bjerrang at
http://www.mamut.com/polarpost
He also has a Svalbard postal history page at http://home.online.no/~polar-ps/posthistory.html