Zephyr is a great new iPhone and iPad client for App.net, the ad-free social network. It’s universal and brings a polished, unique interface to using App.net, right down to its refresh animation.
When you pull down to refresh your stream (which is Unified by default; you can toggle that in settings), the animation indicator on top lights up as you pull. If you slowly move your finger back up to replace your stream without refreshing, the lights also slowly turn off.
Zephyr is just $4.99 in the App Store for both your iPhone and iPad, and I definitely recommend it.