Here's a new iPhone app to hit the iTunes store, entitled 'Nikon lenses' - I was rather surprised that it wasn't called 'Nikkor lenses' as that is by what they are known but nevertheless it looks like a competent app. The 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).
If you would like to try out this app, download it for free, here