Ever since Digg purchased Instapaper from Marco Arment, the news aggregator super site has been adding new features to the somewhat neglected service to better compete with the likes of would-be challengers like Paper.
Continuing that trend, Instapaper for iOS was updated to version 5.1.5 today, bringing some new features, including support for Instapaper’s trending stories, a new send to Amazon Kindle function for subscribers, better AirPlay support, gestures and more.