EXPEDIA is doing something similar
Book today and receive $50 for free gas!
For a limited time, book a hotel of 3 or more nights with your MasterCard® card to receive $50 for free gas. A $50 Gas Money Prepaid MasterCard* will be mailed to you- but be sure to use it by August 31, 2008. Offer available while supplies last and is available on Expedia Special Rate hotels in the US, Canada and Mexico only.
Here's how:
• Book a participating hotel of 3 or more nights and complete travel by September 30, 2008
• Click on the "Expedia Extra" link on your confirmation page and follow the instructions to receive your free rewards card from Expedia
• Allow 3-6 weeks for delivery
Participating Hotel Details: This offer is not valid on stays at Marriott branded hotels, Ritz-Carlton Hotels and Renaissance Hotels & Resorts.
*Rewards card is redeemable at your favorite station or any other merchant that accepts debit MasterCard.
Love the part about allowing 6 weeks to use the card that expires on 8/31/08 