Stamp Collecting Blog
Bloging and stamp collecting lets you talk about your collection with people on the other end of the world or next door.
If you check this blog out don't miss this page: Generally Speaking.
Canadian Postal Archives
Library and Archives Canada contains an extensive archive of Canadian stamps. It is simply a database of stamps they don't concern themselves with philatelic prices but it is a good source to identify stamps.
A good source for identifying and pricing Canada and its provinces stamps.
Mystic Stamp Company
Another good source for identifying and pricing U.S. regular issues, commemoratives and airmail stamps.