The Japanese National Archives have a nice set of late 1930s, pre-World War 2, civil defence posters, created in response to their hostilities with China: General Air Raid Defence; Blackout Control; Fire Protection; and Gas Attack. via Airminded, an excellent blog on "Airpower and British Society 1908-1941, mostly." [more inside]
Chinese Public Art The Workers' Paradise has always produced propaganda artwork. Lately, though, the subjects are sometimes at odds with tradition.
Japanese Medical Prints. Part of the Clendening History of Medicine Library, at the Kansas University Medical Center, and donated by Dr. Matthew Pickard. The digital collections at the Clendening Library also include Florence Nightingale's letters, old school Chinese public health posters, and images from old medical and natural history texts.
China Avant-Garde is a wonderful site for exploring Chinese post Cultural Revolution art, with excellent accompanying texts. Browse the featured artists and see an Exhibition from a Private Collection. Also, Inside Out: New Chinese Art is a beautiful site focusing on this recent "explosion of diverse work that is simultaneously exhilarating and bewildering", and you will find more great examples at Chinese Contemporary (click on the artist's name for information and all thumbnails for that artist), plus marvelous Chinese avant-garde posters at Rene Wanner's poster pages and Who's Who in Chinese Posters, and at the Hochschule der Kuenste, Berlin (view works here).