From:
http://community.priorityclub.com/message/10422#10422
Just find that forum has finished the 2010 Q1 Code Summary.
You can click the code link to regsiter directly.
Below code has conflict. that means if you register one, you can not register others and change mind.
So it is better to choose one from them.
Conflict Codes:
9659: staying at 2 different hotels (any brand) 10000分 (Best)
6677: stay at 2 brands between January 1 and March 31, 2010 to earn 10,000 points. (Secondary Best)
5667: get 10,000 points bonus for staying 3 times between 1/1 and 3/31/2010. (Secondary Best)
3002- stay 8 nights between 1 January and 31 March 2010 earn 10,000 points. (Third best, If you has a long stay, it good)
Other codes(If you can registered the above code, you can skip these codes
3671 Promotion: STAY 3 BRANDS, GET 10K POINTS (6677 above is better than this)
4004: get 10,000 points bonus for staying 7 times between 1/1 and 3/31/2010 (5667 above is better than this)
8256 15,000 Points for 15 Stays (Not good)
7010: staying 10 nights get 10,000 points (3002 above is better than this))
6278 Stay 18 nights and get 15,000 points (Lots of nights needed)
1003 Stay 3 nights and get 5000
2001 Stay 4 nights and earn 5,000 bonus points.
Non-conflict codes:
9581: One Stay 1,000 points or 200 miles for every qualifying night 1 February - 30 April 2010
1882 Ambassador Accelerator, Earn 20,000 points for every 15 qualifying nights 27 Aug 2009 to 31 Dec 2013
Possible still alive old codes:
Code: 4310 Promotion: 5000 POINT PLATINUM BONUS (After you reach platinum, 5000 bonus code)
Code: 6186 Promotion: 5000 POINT PLATINUM BONUS (After you reach platinum, 5000 bonus code)
Code: 2318 Promotion: Anniversary Bonus Offer (1,000 points per stay)
Code: 6198 Promotion: WELCOME BACK BONUS
Code: 6370 Earn 1,500 bonus points for your next stay within 90 days.