Timely article in the WSJ today about websites that sure look like an official hotel site (Hilton, Hyatt, Marriot, etc.) but are in fact copycat reseller sites. How does this happen? Hotels want you to use their site but they also want to cover all the bases so they will allow others to sell their rooms, using websites with almost-identical names.
WSJ says make doubly triply sure you're on the official site, and it doesn't include names like guestreservations, reservationstays and reservationcounter. All they do is sell you non-cancellable reservations larded with junk fees.
I almost fell for this just now, making some Hilton reservations. The first few search results had official Hilton logos but also included those third parties mentioned above.