The NikonLenses app is a guide to Nikon's current lineup of F-Mount lenses used by both Nikon's digital and film SLR cameras.
You can view all the lenses at once or you can view lenses in a selected category. You have the ability to sort by aperture, minimum focal length and ESP (Estimated Retail Price). You can also search on lens names.
Each lens has a detail page which provides links to the Nikon web page detailing the lens, reviews of the lens from third parties (if available - brand new lenses might not have reviews yet) and where to rent the lens (United States only).