About Postcards - A reference resource for the postcard collector.
Behind the Green Door - Postcard articles and links.
Emotions Cards: Postcard and Greeting Card Museum - A history of postcards.
Family in a Shoebox - A box of postcards lead to a trail of another woman and her life. A true story.
Glossary of Postcard Terms - From The Encyclopedia of Antique Postcards by Susan Brown Nicholson.
How to Identify Real Photo Postcards - From the Postcard Auctions at Playle's.
International Federation of Postcard Dealers - Although primarily a postcard dealers organization, the purpose is to encourage professionalism, increase confidence, strengthen ethics as well as advance and promote the postcard hobby worldwide.
Lisa's Postcard Site - Links and resources for postcard collectors and traders.
Picture Postcard Monthly - Magazine for postcard trading.
Postcard Collectors' List - Dealers and collectors database.
The Postcard FAQ - Frequently asked questions about trading postcards on the world wide web. By Marcel Marchon and Leslie Carl Seiler.
Postcard Group - Email list about collecting and exchanging postcards.
Postcard Pages - Postcard pages: collecting and news.
Postcard SIG - Links to postcard related sites around the world and Mensa postcard related postcard groups.
Postcards Email List - An online interactive newsletter which is almost like an ongoing conversation on the subject of postcards.
Postcardy - Explore the world of postcards.
PostSecret - Anonymously contribute your secrets on a 4x6 inch postcard. Some postcards are art some are just brutally honest. The site lists local events and has created a book.
Shiloh Postcards: History of Postcards - A history of deltiology; the collecting of postcards in the United States.
Wikipedia: Postcard - A history and glossary of terms for postcard collectors.
