Starwood just announced another new benefit for its SPG credit card from Amex: get a free third night when you stay 2 consecutive nights at a Sheraton. In addition, they are celebrating this new feature with a sweepstakes called the “Thank Goodness It’s Thursday” giveaway. Every Thursday between today and December 1, 2010, 3 people will win a 3-night stay. Each week, the prizes will get progressively better. The first week, the prizes will consist of 3-night stays at a category 3 hotel (21,000 Starpoints). The next week, winners will receive a 3-night stay at a category 4 hotel (30,000 Starpoints). Third week prizes are 3 night stays at a category 5 hotel (36,000 Starpoints). In the final week of the promotion, winners will receive a 3 night stay at a category 6 hotel in the form of 60,000 Starpoints. For rules or to enter the giveaway, see this link.