Are Instapaper 4.0 Enhancement Enough to Counter Free iOS 5 Safari Reading List Feature?

One of the risks of creating a great single feature app is that its target platform will integrate that feature into itself at some point. Instapaper for the iPhone and iPad is an interesting case in point. Instapaper, a $4.99 app, lets you save web pages for offline reading. The new Safari web browser Reading List feature introduced in iOS 5 provides the same capability for free. In response, Instapaper’s developer released a new version that provides significant enhancements and new features.