Macworld: “New in Instapaper Pro 2.0 is one of Arment’s most-requested features: support for organizing articles into folders, which the online Instapaper service recently gained (at this time, Arment plans to keep this feature exclusive to the paid Instapaper Pro iPhone client).”

It’s on sale, too — just $5, half-off regular price. I’m a fan, and I recommend it.