As most of you know, I strive to earn as many free air miles online as possible. In my opinion, the best online resource is PlanetAll. After signing up, you earn 100 miles for each additional person that signs up. Ten signups equals 1000 miles on your choice of American, Continental, Delta or United.

Their service is absolutely free and quite useful too. Amazon.com recently purchased their entire operation.

Of course, if you plan to sign up, I won't complain if you let me earn referral credit.