Miles for your time and thoughts

The "E-miles" program, offering frequent flyer miles in exchange for your time and thoughts (fill out surveys), is currently offering a sign-up bonus of 250 Northwest Airlines miles to new members.
The program is available to Delta, Continental, and US Airways members as well, though not with a sign-up bonus.

I've used e-miles for the past several months. I recommend not using your primary email address as new offers and other associated junk mail may soon fill your box. The earned miles post too your respective frequent flyer program each quarter in 500 mile increments.