I just want to second what others have pointed out about Passbook on the iPhone. It would be great if the Hyatt app would directly interface with it and create a reservation "ticket" in Passbook. (Similar to how the airlines push boarding passes to Passbook if you check in using their apps. It is handy.)

Of course the real win would be if I could check in and collect my room key quickly at a lobby kiosk using Passbook!!

I hope someone at Hyatt reads this board and they take these enhancement requests into consideration.