It only took a few minutes with the free version of Instapaper on the iPod to make it quite clear that this is one app worth paying for.
Marco Arment sums up the app better than I can:
Instapaper facilitates easy reading of long text content.
We discover web content throughout the day, and sometimes, we don’t have time to read long articles right when we find them.
Instapaper allows you to easily save them for later, when you do have time, so you don’t just forget about them or skim through them.
Simply and straightforwardly, Instapaper works in conjunction with a simple web interface to download articles or blog posts — or anything else that the handy bookmarklet can save — to your iPhone/iPod Touch, making them available offline for reading whenever the time and mood strikes.
Unlike altogether too many App Store applications, Marco offers a free version of Instapaper along-side the “Pro” version, which means that it’s easy to test out the app without making a commitment. Before a trip to Dallas a few weeks ago, I downloaded the full-featured free version and loaded it up with maybe a dozen long-ish blog posts and some other things I have been meaning to read. This process is about as simple as it gets: Click the “Read Later” bookmarklet to save any article to your Instapaper account, and then sync the Instapaper app to that account. The app will download both web- and text-only versions of the article and save them to the iPod. Later, on the plane or between meetings at that wifi-unfriendly hotel lounge, just open up Instapaper and there you find the articles:
Open one up and read away. (Instapaper Pro even saves your position so you can come and go from long articles easily)
Since it’s a bookmarklet, you can sync Mobile Safari on your Pod/Phone and flag things for later reading while you’re on the go, as well. And since the backend of Instapaper provides a web service, you can also read and manage all those articles from any web browser.
The Pro version does have some nice added features that are worth the $10 purchase price. But what makes Instapaper truly worth the money is that the developer has, in my mind, made precisely the kind of app that’s worth supporting.