Just received an email from AA.
We would like to provide you with an important update to the American Airlines AAdvantageŽ program. Effective July 1, 2010, the Marriott Rewards program will no longer offer AAdvantage miles for stays at Marriott hotels.
All qualifying stays at participating properties completed by June 30, 2010 will be eligible to earn AAdvantage miles. It is also important to note the final date to convert your Marriott Rewards points to AAdvantage miles will be June 30, 2010.
Glad I got my LT Plat. Marriott TPs were a crucial factor in doing so.