The app is universal, so it works on all iOS devices. It doesn’t seem to be possible to post to the CR or comment on YWN from inside the app.The app does not support downloading articles for offline-reading, which would be a must for iPod Touch users (who don’t have 3G).
A separate CR app would be cool. It would be nice if the whole site would be optimized for portable devices (I.e. mobile.theyeshivaworld.com)