On Tuesday we released version 2.0 of the ProPublica iPhone/iOS app -- and there's lots new.

First, and most noticeably, the app takes advantage of the larger screen size of the iPad. We designed our pages on the iPad to make finding articles fast, and reading articles easy. The main page presents, all in one place, a comprehensive overview of ProPublica's latest investigations. Article pages have large type and are free of clutter.

On both the iPhone and iPad (and the iPod Touch, too), the app includes all of our coverage, from major stories like our probe into the roots of the financial collapse to daily dispatches on the oil spill. It even includes our daily list of links to great investigative reporting from other news organizations.

On all devices, the app now works in both portrait and the landscape orientation, and it supports fast app switching in iOS 4.0 so you won't lose your place when you leave the app briefly to answer an e-mail.

While some journalistic apps require users to "save" stories to read them offline, all of the stories that appear on the ProPublica app are available offline, without any special action on your part. Simply launch the app, wait for it to update (which can take a minute or so the first time), and all of the stories you see will already be available on the subway, on an airplane, and even if you hold your iPhone the wrong way. For readers who prefer it for long articles, the app now supports saving to Instapaper.

And as always, the app is free.

If you're using the older version of our app -- or if you're reading this from an iPhone using our mobile-optimized site, please head over to the App Store and download or upgrade for free. If you like our app please be sure to rate it in the iTunes store -- it will help persuade others to download.

If you have any problems or questions, e-mail me.

Many thanks to Russell Quinn, who worked with us on the design and software coding of the app, and to Solspace, our content management system developers.