Your "favourite" iPad app?

[Slinky]

I know we've got the iPad apps wiki, but I'm interested to know what your favourite app is? The app that you think is the best you have..

For me it's Flipboard, it just works so nicely and delivers content so well.. Ideally I'd like to be able to have all of my feeds in one view, but that's a very minor gripe..

Over to you..