It is EZ to sign up for a credit card bonus deal. You get the card and then buy what ever you want with the card. Not rocket science and not much to keep track of other than spend (X-$$$) inside of (X-months) = points.
But there are a bunch of other deals that take just a little more time and entering of you data and then following up and the Delta points rewards can be big. Look at some of the ongoing deals right now:
Marriott has a deal where you can earn up to 50,000 points. (note you can ONLY register if you pick skymiles as your rewards for stays).
Hilton has one where you can earn 2012 points per stay.
Hertz up to 3,400 with rentals
You gotta eat, so Skymiles Dining can earn you a lot and 1,200 bonus points.
There is a new survey site that many have already been e-Mailed about called Whiteboard.
Also you can still get points for Fedex Shipping
And all of these can be found on the official Delta.com web site.
So please take some time now and then to make sure you are maximizing your Skymiles earnings for all your activities you can and naturally pay for them with the card that get’s you the most points as well! – Rene