Postcard Group
Email list about collecting and exchanging postcards.
ourworld.compuserve.com Details

Postcard Pages
Postcard pages: collecting and news.
www.postcard.co.uk Details

Postcard SIG
Links to postcard related sites around the world and Mensa postcard related postcard groups.
www.geocities.com Details

Postcards Email List
An online interactive newsletter which is almost like an ongoing conversation on the subject of postcards.
groups.yahoo.com Details

Postcards Mailing List
Postcard swapping is becoming a huge hit on the Internet(real postcards not electronic ones). It is a fun and interactive hobby that will have you exchanging with people all over the world.
groups.yahoo.com Details

San Francisco Bay Area Post Card Club at postcard.org
Questions answered, reference information and links, picture galleries, event calendar for United States and San Francisco Bay Area, illustrated newsletter, and information about club activities and membership.
www.postcard.org Details

Sherry's Home for Unwanted Postcards
Do you have some postcards that aren't worth keeping or trading but you just can't bring yourself to throw them away?
www.geocities.com Details

The Postcard FAQ
Frequently asked questions about trading postcards on the world wide web. By Marcel Marchon and Leslie Carl Seiler.
ourworld.compuserve.com Details