This one probably suites me best:
You've chosen to earn 25,000 bonus Starpoints with every 10 stays.
Marvelous decision. You're poised to earn 25,000 bonus Starpoints® with every ten eligible stays (up to 40 stays and 100,000 bonus Starpoints) between October 1 and December 31, 2008. Simply enter your SPG® number and current email address below to register
Will probably put 20 stays to SPG during this period. Hyatt's FFN is more tempting option until the end of the year.