Discovered Pages
[Discover] ART GONE POSTAL | The Envelope Collective http://www.envelopecollective.com/
(art illustration mailart collective) 
[Discover] Mailart Graphics http://www.k-type.com/fontmag.html (font fonts free webdesign)
[Discover] Bad Press Books - Stamps Information http://www.badpressbooks.com/stamp_info.html (want mailart books art)
[Discover] MAiLmeART.com - the ongoing mail art project for artists, illustrators and general doodlers http://www.mailmeart.com/ (illustration community illustrators project)