Sparrow Is an Attractive, Minimal Email Client

Sparrow Is an Attractive, Minimal Email Client: "Mac OS X: Beta email client Sparrow is a minimal desktop app that easily plugs into Gmail—and any IMAP account in the future—and supports many of the handy things you'd hope for from a native email client.

That includes drag-and-drop attachments, Growl integration, a decent array of keyboard shortcuts (though we'd prefer if they were more Gmail-like, since Gmail is currently the only app they support), and so on. Its main selling point is that it's light and attractive. One serious problems for hardcore Gmail users: It currently doesn't support labels—though they're planning to add label support in a future release."