From: Southwest Airlines
Subject Line: 50% off a Mystery City Each Day
Date: April 24, 2009
 

I love the way Southwest took a 50% off sale and made it a game. Sticking out in the inbox these days is a challenge, and this is the perfect example of how simple clever can be. Best of all, I love how they do not include the city in the subject line. It forces me to open the email. Very smart. While I'm not in the market to fly to Philly today, I can tell you this: I'm hooked. I'm already guessing about what tomorrow's city will be.