ReadSquare is a single place to read what you and your friends find interesting. Log in to Twitter and Facebook and we'll find articles posted by friends for you to read. Add a Google Reader account to include news you've subscribed to.
Every article is completely stored on your iPad. Once you sync, you can take your reading on the train, away from your internet connection. Anything you do while not connected will be updated when you next sync, automatically.
Every article found is linked together by Tags and Sources. See all the articles recommended by a particular friend, or everything from Facebook, or for a particular topic. Wander between items and categories as you find things that look interesting.