If you find yourself short on cash but long on miles for the holidays, consider spending a little with designated retail partners of airline programs. Continental (Miles for Merchandise), Northwest (WorldPerks Mall) and United (Mileage Plus Mall) all offer their own online shopping experiences, where you can spend your miles on merchandise ranging from books to accessories to computers. Delta, Northwest, US Airways, America West, Midwest Express, Hawaiian, Hilton and Amex are allied with MilePoint.com, where you can spend your miles and points with over 50 featured retailers, including Amazon.com, Lands End, and Sharper Image.