Postcard Group 
Email list about collecting and exchanging postcards.
http://ourworld.compuserve.com/homepages/lcseiler/instr.htmPostcards Email List
An online interactive newsletter which is almost like an ongoing conversation on the subject of postcards.
http://groups.yahoo.com/group/POSTCARDS/
Glossary of Postcard Terms
From The Encyclopedia of Antique Postcards by Susan Brown Nicholson.
http://www.geocities.com/Heartland/Meadows/2487/glossary.htm
Lisa's Postcard Site
Links and resources for postcard collectors and traders.
http://www.geocities.com/Heartland/Meadows/2487/
Family in a Shoebox
A box of postcards lead to a trail of another woman and her life. A true story.
http://www.king.igs.net/~bdmlhm/shoebox.html
Picture Postcard Monthly
Magazine for postcard trading.
http://www.postcard.co.uk/ppm/index.htm
Behind the Green Door
Postcard articles and links.
http://www.postcardpost.com/green.htm
Postcard Pages
Postcard pages: collecting and news.
http://www.postcard.co.uk/
Postcard Collectors' List
Dealers and collectors database.
http://members.shaw.ca/pcpage/list1.htm
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.
http://www.playle.com/IFPD/
The Postcard FAQ
Frequently asked questions about trading postcards on the world wide web. By Marcel Marchon and Leslie Carl Seiler.
http://www.overanalysis.org/postcards/faqsec0.htm
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.
http://postsecret.blogspot.com/
Shiloh Postcards: History of Postcards
A history of deltiology; the collecting of postcards in the United States.
http://www.shilohpostcards.com/webdoc2.htm
Emotions Cards: Postcard and Greeting Card Museum
A history of postcards.
http://www.emotionscards.com/museum/museum.html
Wikipedia: Postcard
A history and glossary of terms for postcard collectors.
http://en.wikipedia.org/wiki/Postcard
Postcardy
Explore the world of postcards.
http://www.postcardy.com/
About Postcards
A reference resource for the postcard collector.
http://aboutcards.blogspot.com/
