Yet another link to a great site... Plan59.com, "the museum of mid-century illustration" : hell of a program!
The most difficult part have been to choose 2 of those vintage illustration to make this article, there's so many great pictures!
Here's a short selection :
... I give up, there's too many of these!
So, a bunch of 40's-70's US adverts-like vintage pictures... Pure gold mine to me!
I don't know for you, but I directly go back to this site... Enjoy!