Through Dec. 31, 2011, IHG Priority Club Rewards members can earn 500 bonus points or 100 bonus miles for every night of their stay at any IHG hotel. Members can earn the bonus on up to 40 nights and earn up to 20,000 points or 4,000 miles. And if you stay at different brands, you can double, triple or quadruple your bonus. Registration is required at http://www.priorityclub.com/insideflyer4x