Twitterific is probably the best Twitter app on the iPad. But you've heard all about it. The nicest to actually look at? One you haven't, a little app called TweetFlow.
Two-dimensional and cartoony, it eschews gradients and faux dimensionality for a refreshingly flat aesthetic. The app is pretty basic, but it's super easy to use—having plowed through nearly every iPad Twitter app in the App Store, it's mind boggling how complex some of them have become—and just as importantly, it's free. [iTunes]