Per FT, there’s another bonus promo Amex is running from April 15, 2007 to June 15, 2007. This particular offer is for select Starwood Preferred Guest credit card holders.

You’ll earn a 25% Starpoint bonus on all purchases made during the promo period on your SPG Amex. If you are eligible, you can enroll by visiting http://www.americanexpress.com/starwoodbonus1 or calling 1-800-794-1308 and entering promo code 086650001.