Just after Google announced its Google Checkout holiday promotion, PayPal announced its own offer for customers who use its payment service. Customers can receive 20 percent cash back on purchases made with participating merchants for a maximum of $50 cash back per PayPal account. (Payments at Overstock.com must each be for at least $100 to qualify.) The promotion runs through December 10, 2007 - the day many are expecting to be the busiest shopping day of the holiday season.

Google Checkout offers range from free shipping to discounts of up to $50 off select purchases on each participating merchant's website, and runs through December 17, 2007. In addition, consumers can earn up to 10,000 frequent flyer miles on qualifying Google Checkout purchases through December 31, 2007 (http://www.auctionbytes.com/cab/abn/y07/m11/i26/s02).

Both promotions are limited to US residents only.

https://www.paypal-promo.com/holiday/slider/index.html?s=cashback