Via Free Frequent Flyer Miles, the new Delta iDine (Rewards Network/Dining for Miles) bonus is a pretty good one, registration required:
Earn 1,000 bonus miles when you spend $50, plus 1,000 more miles for every additional $100 you spend cumulatively (including tax and tip) at participating restaurants between 4/28/08 and 6/30/08 – up to 5,000 bonus miles.
That’ll make me switch my dines from the credit cards I have registered with United and American over to the one I have registered with the Delta program until I’ve spent $450 at participating restaurants.