Free ways to earn miles can be found at some of these sites:
http://www.freefrequentflyermiles.com/index.htm
http://www.milemaven.com/
http://www.frequentflyerbonuses.com/
http://www.smartertravel.com/frequent-flyer/
http://www.frugaltravelguy.com/
and a new one thanks to frugaltravelguy
http://boardingarea.com/blogs/tmtravelworld/
these are my other sources besides FT for milage and points earning
happy reading