Just found this promo, hadn't seen it mentioned here.

https://spgpromos.com/fpsouthwest/


Get a Rapid Rewards Credit for Every Stay
Choose from Over 150 Four Points Hotels Worldwide.
Southwest Airlines Rapid Rewards Members can now earn one Rapid Rewards® credit for every eligible stay at more than 150 Four Points® by Sheraton hotels worldwide. There's no limit on how many credits you can earn.

Four Points offers everything you need to travel the way you like at a great price. We have what matters most, like stylish rooms, a comfortable bed, delicious breakfast and great coffee. Plus you'll find free Internet, free bottled water in your room, great local beer with Best Brews™ and other extras that you'll love. With more than 150 hotels located all over the world, we're everywhere you want to be. That's Four Points. The real deal.

To participate in this promotion, you must be a member of the Starwood Preferred Guest® program. If you are not a SPG® member, enroll today for free. Then register for this promotion and stay between August 18 and September 30, 2010.