Nikon offers an app makes it a snap to find virtually every Nikon manual for cameras currently being sold (and even some older models). You can browse pro cameras, point and shoots, and flashes. No more hunting through Nikon’s massive site to find the right manual.
Once downloaded, you can easily browse the manual. You can store multiple manuals on your bookshelf and add unique bookmarks to each as you find useful articles. Manuals can be searched (all the text is live). You can also see a detailed index. One of my favorite features is that all indexes and page number references are live (which really speeds up finding things).