Postcards are a great medium. Their size and shape recalls that of a poster and they allow for more visual appeal because of that. If you subscribe to the notion that your advertising efforts should strive for the pin-up factor (the idea that someone might pin your ad to their cubicle), then postcards are a medium that you should seriously consider.
As a word-of-mouth marketing campaign for the non-profit The American-Batticaloa Development Fund, An Ad Guy has prepared this 4×6 postcard/handout.
Eighteen years ago I came up with an ad layout for Torres wine while working at an ad agency that held the account. It was one of three concepts I developed that I felt really proud of—so much so that I’ve consistently shown the rough comp in my portfolio at practically every job interview since then.