Rocketmiles is an online hotel booking engine that gives frequent filer miles as rewards. They claim the average reward is 7k miles for a booking. They just added Southwest Rapid Rewards. They already give AA/US and UA miles, along with quite a number of other foreign and domestic airline programs (Virgin, Flying Blue, Aeroplan, etc.). DL is the only major US program for which they don't offer miles. I've seen Rocketmiles compared (not always favorably) to Pointshound.The Southwest addition does give them a leg up on Pointshound. Your thoughts?