[dstone]

Off the top of my head, the big ones are offline reading, keeps your furthest-read position (especially across devices), Kindle integration. I'd pay $5 for any one of those alone.

The new features in 3.0 that Marco seems to think are the differentiating features are the ability to see friends' saved articles and editorial content. The editorial picks are pretty good, but nothing that you couldn't get with Reading List. The social integration works if you know people who have Instapaper.

But those first three are really the nicest bits, in my opinion.

[Lazlo_Nibble]

Instapaper also works from any browser on any platform. I don't see that happening with Reading list anytime soon.