Southwest doesn't normally send out very many promo codes for flights since they are already a discount airline. However, Southwest/Airtran is currently running one of their usual specials if you book by April 11th (travel April 16th through October 30th), with select flights starting at just $59 one way. If your particular flight isn't on sale then you may just have to watch it to see if the price goes down. Or if you apply for the rapid rewards credit card, then the points you earn can go towards the price of tickets.
Personally as a card holder I was recently sent a discount on business select, but if you are just looking to lower the "wanna get away" price then it would not be useful to you.
BUT, if you are looking for promos for hotels & cars or vacation packages there are a few that I know of (example: alamo rental cars, double points if going to Las Vegas, etc)
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