Vintage Poster Art at Christopher and Co. 
Extensive on-line selection of vintage posters and reproductions including skiing, travel, Roger Broders, and winter sport posters.
http://www.christopherco.com/Rene Wanner's Poster Page
A non commercial page about posters, poster exhibition and auctions, book reviews and links to other poster sites
http://www.posterpage.ch
Posters American Style
Historic poster art and artists and their impact on American culture.
http://nmaa-ryder.si.edu/collections/exhibits/posters/mainmenu.html
Printmakers A-Z
Features an online collection of prints from Georgetown's collections.
http://www.library.georgetown.edu/dept/speccoll/prints/printsA2Z.htm
Joie de Vivre Vintage Posters
A collection of vintage posters from late 19th, and early 20th centuries. Many themes.
http://www.vintagepostersonline.com/
Stefan Landsberger's Chinese Propaganda Poster Pages
A site dedicated to Chinese political propaganda posters as they have been produced from 1949 until the present day.
http://www.iisg.nl/~landsberger
Artsmile.com
Offers limited edition prints from featured artists. Company based in UK.
http://www.artsmile.com/
Across The Bridge Posters
Vintage US Posters from the 1940's to the 1960's with images and information on each film; e-mail order.
http://www.brooklynposters.com/
