The similarity of the UI to the iPad mail app really gives me the sense of this being a future incarnation of Apple Mail. I haven't used it extensively, but Sp

The similarity of the UI to the iPad mail app really gives me the sense of this being a future incarnation of Apple Mail. I haven't used it extensively, but Sparrow's adaptation of the iPad message list seems very usable so far. The Tweetie-style account navigation might even be better on the iPad than the iPhone-derived hierarchical menus Apple currently uses there.