Still using Yahoo! Mail, eh? Good news! The app just hit v2, which, like most full-version releases, brings all sorts of new goodies. First, and probably the most noticeable, is that the app is now called Y! Mail and it has a brand spankin' new UI. Don't tell GMail I said this, but I actually think Y! Mail's new look is pretty decent.
Aside from the pretty new interface, version 2 also brings increased stability, more reliable push notifications, better battery performance, and better security, as it now has SSL activated by default.