This Chrome plugin automatically detects links that define the "previous" and "next" relations, and enables arrow-key shortcuts to jump to those pages:
https://chrome.google.com/webstore/detail/pkjjfohgdkeomfgelibonoddaaioaopg

Link relations are standardized in HTML5. They are discussed here: http://blog.whatwg.org/the-road-to-html-5-link-relations#rel-first