Hi Yankiebabie
I do the e-miles program- I have been successful in earning a few thousand Delta skymiles - it is mostly reading ads and clicking a few short survey questions.
I also do e-rewards which I personally get Priority Club (Holiday Inn) points for - but I think you can earn airline miles for whatever airline you join under. Those are surveys which you accrue "money" to trade in - I have also gotten a few thousand points through them.
My suggestion is give it a try and if you don't want to be bothered then just unsubscribe