I was able to register. I wonder how I would have found out if it weren't for this forum. It wasn't listed in the "propotions for you" section and I didn't receive an e-mail message about it.
Here's what the deal is:
Earn 1,000 Marriott Rewards bonus points per stay, up to a maximum of 5,000 bonus points with the Marriott Rewards and VISA Summer promotion. Just follow these four steps:
STEP 1: Register – By clicking the "Register" button below or by calling
1-888-MARRIOTT (627-7468)
STEP 2: Book Online – Must reserve your stay on Marriott.com
STEP 3: Stay – At any of over 2,600 participating Marriott® hotels between June 15 and September 15, 2006
STEP 4: Pay – For your stay with any Visa card and receive 1,000 Marriott Rewards bonus points for that stay - up to a maximum total of 5,000 points