If you stay at the Luxor in Vegas, have a Sprint/Nextel phone, and provide your cell number, the Luxor will provide you with all kinds of goodies:
“Luxor guests who have provided their wireless phone number during the reservation or check-in process can receive coupons for discounted meals, show tickets or other offers from Luxor directly on their phones. Using the GPS technology built into Sprint phones, Luxor will be able to determine whether the guest is on the property to estimate which discount offers might prove most useful to the guest.”
I wonder exactly how Luxor pulls the GPS info without me giving them permission.
More details about the program on the post at Gadgetell.