I just wanted to recommend the New York Times reader again. They just updated it so that you can read any issue of the Times from the past week, a really useful feature. I've used the reader extensively on flights by syncing the articles before I leave, and it's been great.
Update (3/16): It looks like the Times reader will soon not be free, and for me, it's definitely not worth the price they are asking. On the other hand, Times Select is now free for students and faculty.