I just registered myself at the following site to get upgraded to gold and a chance to extend it till 2012 if I stay 8 nights within the next 90 days.

http://www.joinmarriottrewards.com/hsbc/en/

Though it says hsbc but it has nothing to do with it. Here is my confirmation and good luck..

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Congratulations! You’re registered to receive complimentary Gold Elite status for 90 days and a chance to enjoy Gold Elite membership until February 2012 if you complete 8 nights within the promotion period.

As a Gold Elite member, you will benefit from:

Room Upgrade*+
Guaranteed Lounge Access/Free Continental Breakfast***
Guaranteed Room Type 1
Free Internet Access ++
Exclusive Offers
25% Bonus on Marriott Rewards Base Points 3
Ultimate Reservation Guarantee+
Priority Late Checkout*2
Stay 8 nights at any of over 3,400 hotels worldwide, as a Gold Elite member within 90 days of joining and enjoy Gold Elite status until February 2012!

Enjoy 15% discount on the "Stay for Breakfast" rate at participating hotels in China and Hong Kong until 28 February 2011, check-in on a Friday or Saturday, minimum 2 nights. Make your reservations on www.Marriott.com, click "special rates & rewards" and enter promotional code D57 in the "Corporate/promotional code" box. Or call 400 888 5551 and quote promotional code XXBV.