I have been training lots of teachers and librarians lately on iPads and their use in an educational setting. I have a myriad of apps on my iPad and I talk about different ones based on the composition of my audience that day. Someone in the audience at a session pointed out that I had Flipboard, and I had honestly forgotten about it.
Flipboard is a wicked cool app that pulls feed from social media you set up and presents it in a digital magazine format. I have my Facebook and Twitter accounts set up to feed into Flipboard as well as my Google Reader. Explore Flipboard content and connect to feeds in many content categories from Travel to News to Entertainment. I love this "one stop app" for a plethora of content. (I was in a ""et's use big words" mood.)