Readability’s iPhone app for reading articles later was rejected by Apple almost three weeks ago. And so, between now and then, they’ve turned out this top-notch web app as an alternative.
You save it as an app to your iPhone Home screen and it uses HTML5 offline storage support so your articles are available for reading later even when not connected to the Web. Even articles you favorite or archive will sync up next time the app is launched when you’re online.
Also, MG Siegler has written more about it on TechChrunch.