Noticed a couple of promos are back that I didn't notice anyone mention yet:
AAA: 10% off + free breakfast
http://www.hyatt.com/hyatt/aaa.jsp
Costco: 10% off + $25 daily credit (up to $125 credit I think and no credit for Summerfield Suites)
https://costcotravel.com/?rc=6&ancil...lsAndResorts#0
AARP: Same as the Costco offer
http://www.hyatt.com/hyatt/offers/index.jsp?accid=aarp
They all seem to be 11/14/11 through 2/29/12