Mine also says Marriott Rewards Summer 2009 Promotion

But I got a slightly different offering: 15k pojnts for 6 stays.

Leave your cares, your work and your world behind. Sign up now to earn 5,000 Marriott Rewards bonus points after every other paid stay – starting with your second stay. It's a quick and easy way to earn up to 15,000 bonus points toward a free getaway of your own.

Typical, I have three stays between now and May 31st and maybe 2/3 until September when I will pick up again. I'd rather have the points than the double nights.

D