That just changed. In the past, The Atlantic published fiction in every issue. They pretty much stopped printing it, but now they are selling it again! They have announced they will sell two short stories a month on the Kindle. This is an exciting development (although one not yet mentioned on The Atlantic's submission guidelines). The Times article in the link above refers to the "iTunes-ization of short fiction." I think the iTunes model is far better than the "for copies only" small literary journal model, but I think the price is too steep. Fictionwise has been selling short fiction for ages and they rarely charge more than $2.00 for a short story. Maybe The Atlantic thinks Chris Buckeley's 15,000 word short story is worth $4, but I don't know that every story they offer will be the same length or have the same author-name recognition.
The Times article also says the story will be accessible only to those with Kindles and iPhones, which is not true, now that Kindle for PC is out. If you have an Internet-connected PC, you can download the app and buy Kindle "books" (even the free ones).
Time will tell, but in the meantime, I put in a poll (my first LJ poll!). Tell me how you feel about paying for short fiction.
ADDENDUM: Shovel Kings, by Edna O'Brien and Cynara, by Christopher Buckley, do both offer free samples, just like a regular Kindle ebook.
Would you pay $3.99 for a short story in electronic format?