Just found this on Marriott's home page:

You already know that PointSavers is Marriott Rewards® best deal for redeeming your hard-earned points towards a free hotel stay.

Now – we’ve sweetened the deal. You still save when you redeem for a PointSavers stay – PLUS you earn a rebate. Marriott Rewards will return up to 15% of the points you use toward your ultimate getaway as our gift to you.

It’s simple:

STAY on any PointSavers award between September 9, 2009 and January 15, 2010 and
be rewarded with:

15% Point Rebate - Gold Elite and Platinum Elite members
10% Point Rebate - All other Marriott Rewards members
Stay longer for less at hotels from California to China.
But hurry, you need to register and stay by January 15, 2010.

I have a Points Stay booked about a week ago, during this promo period and called MR and was told that the 10% off (I'm only a silver)will be taken off after my stay.....not a bad deal every little bit helps>^