Flipboard

This is the app that uses up half of the battery life on my iPad (the other being Words with Friends). Flipboard is billed as "a new approach to browsing social content" - a magazine-format aggregator for your mobile device. What?

It collects the content of various sites (including Facebook and Twitter, but I really like the news portions) and allows you to swipe the pages to browse the content which is beautifully laid out. It's quite intuitive, and I can lose track of time while flipping through the pages.