Marco Arment has updated his popular Instapaper Pro application, adding basic iOS 4 support and renaming the application to simply “Instapaper,” dropping the “Pro” designation. Instapaper 2.2.4 continues to support all of the features of the previous “Instapaper Pro” version and adds support for Fast App Switching on iOS 4, swipe gestures for page-turning on iOS 4 and iPad devices with improved page turn performance and OAuth support for Twitter. The update also fixes minor interface bugs related to the actions menu, the folder list and zooming of text. iOS 4 multitasking support is currently limited to Fast App Switching; background task completion for synchronization is expected to be coming in a later update. Instapaper 2.2.4 is a universal app and is available from the App Store for $5; a free version is also available for the iPhone and iPod touch.