Nikon add Lens Postioning Map
Nikon has added an intriguing Lens Postioning Map, allowing users to plan their range, add new lenses and compare coverage against the optics they have already. I'm not sure how helpful it is, but as a marketing tool it works quite well to promote their range even if it masks some of the shortcomings with their older lenses. Still, to their credit, Nikon are working they way through them, one by one.
Perhaps of more help to people is the Lenses Simulator, you can use it to see just what coverage your prospective purchase will give you.