speaking from experience:
No Ritz-Carlton has EVER asked me for ID.
I booked my corporate rate once at the FS. The told me over the phone that they would need to see ID at checkin, but never asked when I showed up (I didn't have any extra business cards with me, so it's a good think nobody asked to see ID, but I doubt they would have made an issue over it in front of everyone else at check in).
Does anyone have any experiences when they were asked for ID?