David Carr's piece What Writers Are Worth Saving? Web Service Runs the Numbers (New York Times, 8.12.11) sheds interesting light on the relatively new phenomenon of marking articles to read at another time. Nat Weiner, founder of Read it Later, an app which allows you to save articles with one click and return to them at your leisure, regularly analyses the data his app collects. A year ago he noted that new technology, notably the iPad, is changing not just where we read, but also when.
When a reader is given a choice about how to consume their content, a major shift in behavior occurs. They no longer consume the majority of their content during the day, on their computer. Instead they shift that content to prime time and onto a device better suited for consumption. Initially, it appears that the devices users prefer for reading are mobile devices, most notably the iPad. It’s the iPad leading the jailbreak from consuming content in our desk chairs. As better mobile experiences become more accessible to more readers, this movement will continue to grow. Readers want to consume content in a comfortable place, on their own time and mobile devices are making it possible for readers to take control once more. 
Now Weiner has reported on the most-read writers, those most commonly saved in the Read it Later app. Unsurprisingly, since this is an early-adopter activity, Lifehacker comes out top. Carr reports
Nine out of 10 of the most saved worked there — Kevin Purdy, Adam Pash and Adam Dachis came in first, second and third — which indicates a strong Silicon Valley/West Coast bias and a very narrow one at that. That makes sense, given that clicking-to-save is a techie sort of thing to do. The other writers who round out the top 20 bear that out. They include MG Siegler of TechCrunch, Cory Doctorow of Boing Boing and Jesus Diaz of Gizmodo.
But it's early days, and I'm sure the habit will soon spread beyond the early adopters. It's yet another way in which the web facilitates an increase, not a reduction, in what and how we read.