Right now through July 31st, 2013 you can earn Double the air miles reward miles! I must admit the promotions wording is rather tricky and a bit misleading so I wasn't going to post this but it's still worth knowing about if you stay at these hotels frequently.
The wording states "On every qualifying stay, starting on your second stay. Stay at Staybridge Suites hotels or Candlewood Suites hotels and you’ll start earning double on your first qualifying stay. Now, go discover all the world has to offer and earn while you’re there."
What this means is that you need to stay at one of these places TWICE. Then you'll earn Air Miles on all your nights. Furthermore, you must register a IHG Rewards Club membership number in advance. Valid email address is required for registration.