Perhaps it is merely a symptom of working in academic administration, but I really enjoy the blog called A Soviet Poster a Day. The Soviet poster blog describes its mission in these terms:
Every Soviet poster no matter the date of creation bears a stamp of expressiveness and graphical quality. The attention to details is awesome. The scope of techniques is endless. Soviet posters are a treasure chest with inspiration for any graphical designer, not to mention the seeing pleasure itself. And what's important, every Soviet poster has a historical reference essential for understanding the layers of meanings it carries through time.The most recent specimen is called Long Live Pluralism! Glory, glory to the Soviet people.