Check out this huge, amazing collection of mid-century commercial art and advertising. It’s all been scanned with loving care and just looks gorgeous.
Aside from the artwork itself, it’s also a fascinating anthropological look at middle-class America in the 1940s and 1950s: for example, the implicit messages (what those philosopher types call ‘semiotics’) here, here, here, here, and here are fascinating to look at some 50 years after the fact.