You also get a few additional features on the iPad, such as an in-app brightness control and more font options (six fonts, compared to only three on the iPhone). But one of my favorite iPad-only tweaks is subtler: in tap-to-turn-the-page mode, text is always displayed within the margins, but with scrolling enabled, text at the top and bottom edges of the screen fades slightly, providing cues that you can scroll. It's a minor detail, but it really adds to the reading experience.
For heavy consumers of online content, like me, the Instapaper service is a stellar option for reading lengthier articles; I consider it a must-use. And Instapaper Pro on the iPad has become my favorite way to read and manage my Instapaper-saved articles.
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