About Postcards
- A reference resource for the postcard collector.
- http://aboutcards.blogspot.com/

Postcardy
- Explore the world of postcards.
- http://www.postcardy.com/

Wikipedia: Postcard
- A history and glossary of terms for postcard collectors.
- http://en.wikipedia.org/wiki/Postcard

Emotions Cards: Postcard and Greeting Card Museum
- A history of postcards.
- http://www.emotionscards.com/museum/museum.html

Shiloh Postcards: History of Postcards
- A history of deltiology; the collecting of postcards in the United States.
- http://www.shilohpostcards.com/webdoc2.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/

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

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/

Postcard Collectors' List
- Dealers and collectors database.
- http://members.shaw.ca/pcpage/list1.htm

Postcard Pages
- Postcard pages: collecting and news.
- http://www.postcard.co.uk/

Behind the Green Door
- Postcard articles and links.
- http://www.postcardpost.com/green.htm

Picture Postcard Monthly
- Magazine for postcard trading.
- http://www.postcard.co.uk/ppm/index.htm

How to Identify Real Photo Postcards
- From the Postcard Auctions at Playle's.
- http://www.playle.com/postcards.html#realphoto

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

Postcards Email List
- An online interactive newsletter which is almost like an ongoing conversation on the subject of postcards.
- http://groups.yahoo.com/group/POSTCARDS/

National Postcard Week
- Celebrated in May both in the UK and in the USA. It is hoped for the future that, as more countries join in National Postcard Week it may well become International Postcard Week by the Millennium.
- http://www.postcard.co.uk/npw.htm