SkyMiles Dining - you can earn 10 miles per dollar for eating out at participating restaurants (over 8000 nationwide)

Gold Delta American Express- This card offers 1 miles for each $1 spent on it and 10,000 bonus for signing up. You also receive 2 miles per $1 at drugstores, gas stations, home improvement and hardware stores, the U.S. Postal Service, and your wireless phone bill payments.

Mileage Mall - you can earn SkyMiles for shopping at a variety of online retailers.

Miles for shopping at Columbia House - Buy DVDs, get up to 3000 miles.

Chase MasterCard - This cards lets you earn miles at a rate of 1 mile/$1 which you can then transfer to any of 250 airlines

Miles for mortage or real estate purchase - Contact these guys for a quote, but before commiting shop around first. You might be able to save more then the miles are worth.

Miles for Cruises-Buy a cruise from a Delta partner, get miles. Cruise must be booked on the Delta website.

Miles for Car Rentals - Rent a car from Delta partners, get 50-60 miles/day. Hertz offers more miles/day if you rent for over 5 days.

Miles for Online Trading - Get Delta miles for signing up with Ameritrade

More miles for Online Trading - Get Delta miles for signing up with Etrade.

Miles for Student Loans- Take out a student loan throug Lending Tree, get Delta miles .

Miles for Online Banking - Get Delta miles for signing up with Etrade online bank.

More Miles for Online Banking - Get Delta miles for signing up with Netbank.

Miles for Communication Services -AT&T, T-Mobile, and Nextel would all love to give you some miles for using their services.

Miles for Flowers-Buy flowers from FTD , get 10 miles/dollar.