Double Points or Miles continues in 2009 beginning September 15, 2009. Staybridge Suites and Candlewood Suites hotel stays start earning the double points or miles with the first hotel stay. Other IHG brands: InterContinental, Crowne Plaza, Hotel Indigo, Holiday Inn, HI Express begin earning double points or miles with the second hotel stay.
Priority Club Registration link
InterContinental Hotel stays regularly earn 2,000 points per stay. Double points earns 4,000 points per stay.
Staybridge Suites and Candlewood Suites regularly earn 5 points per US$1 and will earn 10 points per US$1.
Other IHG brands regularly earn 10 points per US$1 and will earn 20 points per US$1 for eligible stays during the promotion period.
Priority Club has nearly 50 airline partners for earning frequent flyer miles. There are different earning levels for different airlines. Hotel brand also impacts the miles earned.
Here is the link to the miles earning terms for USA Priority Club members.