Palimpsest for iPad (iTunes link): http://itunes.apple.com/us/app/palimpsest/id432502081?mt=8

It basically has 4 core features:

  - It presents one new curated longform article every single day
  - it offers a text-optimized view as well as the original article itself
  - it learns your tastes based on upvotes/downvotes on earlier articles
  - it works offline for days at a time

  - longform.org
  - longreads.com
  - givemesomethingtoread.com