http://www.mail-art-projekt.kunstforum-weilheim.de/index.html
http://www.mailart.be/initiation.html
http://www.museum-of-temporary-art.com/index.html
http://digitalmailart.blogspot.com/
http://mailartforums.crosses.net/read.php?4,58831,58831
http://community.livejournal.com/mailart/332903.html
http://www.mailartist.com/kiyotei/postcard.html
http://www.actlab.utexas.edu/emma/Gallery/galleryjohnson.html