The node navigator nodelet gives links to adjacent nodes, nodes of the same type, and nodes by the same author.
Perlmonks is not a book, however it's not less interesting. How about someone is on the PM journey and want to read all the perlmonks nodes starting from 1,2,3.... (wherever possible). Thus a link within node-navigator--> 'next node' to visit in sequence for 'me' would do good. It's like starting where you left-off. This link will be specific to user and not specific to the current node.
Current methods to achieve this could include msgbox, personal nodelet, browser bookmarking or scratchpad, however not as elegant as described above.