More Nights = More Rewards promotion from SPG®. Between January 5 and April 15, 2010. This link is active, but registration begins at 9AM EST on 1/5/2010.

For now here are the details posted by William from SPG.

– Earn double Starpoints for stays of 1 or 2 nights
– Earn triple Starpoints for stays of 3 nights
– Earn quadruple Starpoints for stays of 4 nights or more

Members will earn the reward on the entire length of stay. For example, a 3 night stay earns you triple Starpoints on all 3 nights. Plus, there are no limits to the amount of Starpoints you can earn.

This promo should promote people to make longer stays rather than checking in and checking out every day.

Terms and Conditions

Member must register online at SPG.com/morerewards by March 31, 2010, Midnight Eastern Daylight Time. Member can earn bonus Starpoints with every eligible stay between January 5, 2010, and April 15, 2010, at more than 850 participating properties only. Participating properties found at SPG.com/morerewardsprops are subject to change. Bonus Starpoints® will vary by the number of consecutive nights within each eligible stay; however, there are no limits to how many Starpoints can be earned within the earning window. For eligible stays with one (1) or two (2) consecutive nights, members will earn double Starpoints for all eligible revenue credited for the entire stay. A definition of what comprises eligible spend can be found at SPG.com/t&c under section 5.3. For eligible stays with three (3) consecutive nights, members will earn triple Starpoints for all eligible revenue credited for the entire stay. For eligible stays with four (4) or more nights, members will earn quadruple Starpoints for all eligible revenue credited for the entire stay. An eligible stay is defined as one or more consecutive nights paying a qualifying rate for at least one of the nights in the same participating hotel and posts to the member’s Starwood Preferred Guest® account. A description of qualifying rates can be found at SPG.com under program terms and conditions. Back-to-back stays over consecutive nights at the same property count as one (1) stay per the definition of an eligible stay. However, bonus Starpoints will be calculated based on how the stay(s) post to the member’s account from the reservation(s). Double Starpoints awards a member a total of 4 Starpoints per eligible US$1 spent, triple Starpoints awards a total of 6 Starpoints per eligible US$1 spent, and quadruple Starpoints awards a total of 8 Starpoints per US$1 spent. Elite members still earn 1 extra Starpoint per eligible US$1 spent regardless of any bonusing that occurs. Bonus Starpoints earned will post to the member’s account within 2 to 4 weeks after the qualifying stay posts. Any additional bonus Starpoints earned from another promotion will not be doubled, tripled or quadrupled. All promotions are subject to the Starwood Preferred Guest program terms and conditions, which are subject to change without notice and can be found at SPG.com. Offer is applicable to individual members only and is not available to groups or Starwood employees. Not responsible for omissions or typographical errors. Starwood reserves the right to discontinue this offer at any time. To update your communication preferences or learn about our privacy practices, view our Privacy Statement on SPG.com/privacy, or call 1-877-782-0071 in the U.S. and Canada or +353-21-4930474 in all other countries to access our privacy information line. Starpoints, SPG, Preferred Guest, Sheraton, Four Points, W, Aloft, The Luxury Collection, Le Méridien, Element, Westin, St. Regis and their respective logos are the trademarks of Starwood Hotels & Resorts Worldwide, Inc., or its affiliates. Void where prohibited by law. © 2010 Starwood Hotels & Resorts Worldwide, Inc. All rights reserved.