The Atlantic, excellent in all three of their mediums: their magazine, their website, and their blog of sorts, The Atlantic Wire, has finally merged all their content into one app. It's available for free.
If you're not a subscriber to The Atlantic, you can still access all the website content in the app without paying a dime. The only thing missing for you is the magazine content. If you want to buy an iPad-only subscription, it'll cost you $22.99, that in-app purchase unlocks all content within the app (magazine+website). Single issues are $5.49 a pop. And of course, if you already subscribe to The Atlantic, you get free access with your subscription.
If you like to read on your iPad, the new Atlantic app is where you'll start from now on. Go get it. [iTunes]