In reply to Keir07: I have one and use it a lot (on a D7000, so same sensor) - 16mm is a surprising amount wider than all of the 18-xx kit lenses. It's sharp and contrasty, even wide open at 16mm. It's arguably the best single-lens option for use in the mountains (the better lenses, like the 17-55/2.8, aren't exactly light or small and aren't as wide).
That said, it's a normal zoom, not a wide-angle... it's a good upgrade to your existing normal zoom, assuming that's one of the 18-xx lenses, but if you really want wide-angle you might find yourself wanting a dedicated UWA lens, such as the 10-24 - but then you need a normal and/or tele lens as well.