Similar to the airline offers, Marriott launched a fast track to Elite status program that goes from May 11, 2009 to June 26, 2009. You will receive double credit for each night at a Marriott. Here’s the link to register. It is hard to get Elite status at Marriott because Marriott Rewards do not count stays + nights. You can only achieve Elite status with actual nights - so checking in and out of Marriott hotels throughout the week will not get you Elite status faster.
To earn Marriott Platinum status, you will need to have 75 nights. Marriott’s current fast track to Elite status offer goes on for 7 weeks. If you are a weekly traveler with 4 nights per week, you will get 28 to 30 nights during this promotion period. With double nights, you will have 60 Marriott Reward nights — that will leave you 15 short of Platinum status. I don’t think this fast track to Elite status is worth it unless you have already been staying at a Marriott or are committed to staying at Marriott for the rest of the year.
From the promotion link, I also noticed Marriott has implemented Elite Rollover Nights. If I understand the term correctly, every additional night after the 75th night will count toward next year’s status. This would be a huge differentiator against SPG, Hilton and Hyatt. The hardest part is still getting 75 actual nights.