[yasuki]

You can earn up to 25,000 points by referring 5 people. Marriott gives 1,000 points for each paid stay they make, up to 5 per person. The people referred also get bonus points for each stay, and they have up to a year to make the stays after signing up for Marriott Rewards. They must sign up by March 31, 2008. This program runs from October 4, 2007 to March 31, 2008.

http://www.marriott.com/marriott.mi?page=member-referral