Marriott let me be become an affiliate member earlier this month. It took a bit of time for me to get around to the implementation but I've now done so, with a few value-adds over the other options out there (i.e. ebates, UR mall, etc.). 1) Higher payouts than ebates: I am offering 2.7% cash back on bookings. 2) Compare multiple rate types on a single screen. Marriott won't let you do that on a single search page. I can. Read more about the tools. Search & book.